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37 results on '"Laboratoire de Physique moléculaire et applications (LPMA)"'

1. Recursive computation of invariant distributions of Feller processes

Author

Clément Rey, Gilles Pagès, Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Centre de Mathématiques Appliquées - Ecole Polytechnique (CMAP), and École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Statistics and Probability, Markov chain, Recursive computation, Applied Mathematics, 010102 general mathematics, Markov process, Stochastic approximation, 01 natural sciences, 010104 statistics & probability, symbols.namesake, Mathematics::Probability, Modeling and Simulation, symbols, Applied mathematics, Ergodic theory, Invariant measure, [MATH]Mathematics [math], 0101 mathematics, Invariant (mathematics), Brownian motion, Mathematics
Abstract

This paper provides a general and abstract approach to compute invariant distributions for Feller processes. More precisely, we show that the recursive algorithm presented in Lamberton and Pages (2002) and based on simulation algorithms of stochastic schemes with decreasing steps can be used to build invariant measures for general Feller processes. We also propose various applications: Approximation of Markov Brownian diffusion stationary regimes with a Milstein or an Euler scheme and approximation of a Markov switching Brownian diffusion stationary regimes using an Euler scheme.

Published
2020

2. Growth of thick and heavily boron-doped (113)-oriented CVD diamond films

Author

Pinault-Thaury, Marie-Amandine, Tallaire, A., Valentin, A., Mille, V., William, L., Pinault-Thaury, M.A., Jomard, F., BARJON, J., Achard, J., Groupe d'Etude de la Matière Condensée (GEMAC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), and Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)

Subjects
Materials science, Fabrication, Nanotechnology, 02 engineering and technology, Chemical vapor deposition, engineering.material, 01 natural sciences, Crystal, Electrical resistivity and conductivity, 0103 physical sciences, Materials Chemistry, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, business.industry, Mechanical Engineering, Doping, Schottky diode, Diamond, General Chemistry, 021001 nanoscience & nanotechnology, Electronic, Optical and Magnetic Materials, Semiconductor, engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business
Abstract

Diamond as a wide band-gap semiconductor exhibits unrivalled figures of merit for power electronics. However this application has been held back by the poor availability of thick large-area electrically-conductive diamond material that is a prerequisite for developing elemental devices. Efforts have been devoted to optimizing CVD growth and doping on conventional (100) and more rarely (111) crystal orientations but (113) has yet almost never been considered. In this work we report the growth of thick CVD diamond films on (113)-oriented substrates with various boron doping levels. We found that high-quality films can be obtained on this orientation with a 5-times improved doping efficiency as compared to (100). A thick freestanding CVD plate with a low resistivity and a doping level of 4 × 10 20 cm − 3 is demonstrated which paves the way to the fabrication of efficient Schottky diodes based on this orientation.

Published
2016

3. Ozone isotopic composition: an angular effect in scattering processes?

Author

F. Robert, C. Camy-Peyret, Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de minéralogie, and Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Atmospheric Science, Ozone, 010504 meteorology & atmospheric sciences, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, 01 natural sciences, Chemical reaction, Molecular physics, Atmosphere, Reaction rate, chemistry.chemical_compound, Nuclear magnetic resonance, 0103 physical sciences, Earth and Planetary Sciences (miscellaneous), lcsh:Science, Stratosphere, 0105 earth and related environmental sciences, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, 010304 chemical physics, Isotope, Scattering, lcsh:QC801-809, Geology, Astronomy and Astrophysics, lcsh:QC1-999, lcsh:Geophysics. Cosmic physics, chemistry, Space and Planetary Science, lcsh:Q, Beam (structure), lcsh:Physics
Abstract

The ratio of the differential scattering cross sections involving distinguishable and indistinguishable isotopes may exhibit non-mass dependent angular variations. A numerical application of this hypotheses to the ozone reaction rates reproduces some of the results observed in laboratory experiments. This theory could be tested through a cross beam experiment where the isotopic composition of the scattered products is recorded as a function of their scattering angles.Key words. Atmospheric composition and structure (middle atmosphere – composition and chemistry)

Published
2001

4. Validation of GOMOS-Envisat vertical profiles of O3, NO2, NO3, and aerosol extinction using balloon-borne instruments and analysis of the retrievals

Author

Bernath, P. F., Mcelroy, C. T., Abrams, M. C., Boone, C. D., Butler, M., Camy-Peyret, C., Carleer, M., Clerbaux, Cathy, Coheur, P.-F., Colin, R., De Cola, P., De Mazière, M., Drummond, J. R., Dufour, D., Evans, W. F. J., Fast, H., Fussen, D., Gilbert, K., Jennings, D. E., Llewellyn, E. J., Lowe, R. P., Mahieu, E., Mcconnell, J. C., Mchugh, M., Mcleod, S. D., Michaud, R., Midwinter, C., Nassar, R., Nichitiu, F., Nowlan, C., Rinsland, C. P., Rochon, Y. J., Rowlands, N., Semeniuk, K., Simon, P., Skelton, R., Sloan, J. J., Soucy, M.-A., Strong, K., Tremblay, P., Turnbull, D., Walker, K. A., Walkty, I., Wardle, D. A., Wehrle, V., Zander, R., Zou, J., Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Meteorological Service of Canada, Environment and Climate Change Canada, FastMetrix Inc., Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), NASA Headquarters, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Department of Physics [Toronto], University of Toronto, Department of Physics and Astronomy [Peterborough], Trent University, Department of Physics and Astronomy [London, ON], University of Western Ontario (UWO), NASA Goddard Space Flight Center (GSFC), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S), Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Department of Earth and Space Science and Engineering [York University - Toronto] (ESSE), York University [Toronto], GATS Inc., Canadian Space Agency (CSA), NASA Langley Research Center [Hampton] (LaRC), EMS Technologies Canada Ltd., ABB Bomem Inc., Département de génie électrique et de génie informatique (GEL-GIF), Université Laval [Québec] (ULaval), Bristol Aerospace Ltd., and the European Space Agency (ESA), the French Space Agency (CNES) and the German Space Agency (DLR)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [SDU]Sciences of the Universe [physics], stratosphere, Validation, balloon
Abstract

The UV-visible Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument onboard Envisat performs nighttime measurements of ozone, NO2, NO3 and of the aerosol extinction, using the stellar occultation method. We have conducted a validation exercise using various balloon-borne instruments in different geophysical conditions from 2002 to 2006, using GOMOS measurements performed with stars of different magnitudes. GOMOS and balloon-borne vertical columns in the middle stratosphere are in excellent agreement for ozone and NO2. Some discrepancies can appear between GOMOS and balloon-borne vertical profiles for the altitude and the amplitude of the concentration maximum. These discrepancies are randomly distributed, and no bias is detected. The accuracy of individual profiles in the middle stratosphere is 10 % for ozone and 25 % for NO2. On the other hand, the GOMOS NO3 retrieval is difficult and no direct validation can be conducted. The GOMOS aerosol content is also well estimated, but the wavelength dependence can be better estimated if the aerosol retrieval is performed only in the visible domain. We can conclude that the GOMOS operational retrieval algorithm works well and that GOMOS has fully respected its primary objective for the study of the trends of species in the middle stratosphere, using the profiles in a statistical manner. Some individual profiles can be partly inaccurate, in particular in the lower stratosphere. Improvements could be obtained by reprocessing some GOMOS transmissions in case of specific studies in the middle and lower stratosphere when using the individual profiles.

Published
2008

7. Infrared spectra of SO2 and SO2:H2O ices at low temperature

Author

Jacquemart, D., Mandin, J.-Y., Dana, V., Regalia-Jarlot, L., Plateaux, J.-J., Décatoire, D., Rothman, L.S., Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge], and Harvard University-Smithsonian Institution

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Published
2006

8. Progress in the knowledge of C2H2 spectroscopic parameters in the IR (Communication orale)

Author

Jacquemart, D., Rothman, L.S., Dana, V., Mandin, J.-Y., Claveau, C., Valentin, A., Regalia-Jarlot, L., Barbe, A., Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge], Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique moléculaire et applications (LPMA), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), and Harvard University-Smithsonian Institution

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Published
2006

10. The spectrum of acetylene in the 5-µm region from new line-parameter measurements

Author

Jacquemart, D., Mandin, J.-Y., Dana, V., Regalia-Jarlot, L., Plateaux, J.-J., Décatoire, D., Rothman, L.S., Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge], and Harvard University-Smithsonian Institution

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Published
2006

13. Matrix effect on triatomic CO2 molecule: Comparison between krypton and xenon

Author

H. Chabbi, Pierre-Richard Dahoo, J. M. Coanga, Azzedine Lakhlifi, Laboratoire de magnétisme et d'optique de Versailles (LMOV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'astrophysique de l'observatoire de Besançon (UMR 6091) (LAOB), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Laboratoire de Physique moléculaire et applications (LPMA), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010304 chemical physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Triatomic molecule, Organic Chemistry, Krypton, Anharmonicity, chemistry.chemical_element, Vibrational energy, Crystal structure, 01 natural sciences, Analytical Chemistry, Inorganic Chemistry, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Matrix (mathematics), Xenon, chemistry, Transformation perturbation technique, Lattice (order), 0103 physical sciences, Molecule, Physics::Atomic Physics, Atomic physics, 010306 general physics, Spectroscopy, Molecule–matrix
Abstract

Vibrational energies for low-lying levels of CO2 trapped in rare gas matrices are determined for four isotopic species by applying a theoretical model allowing contact transformation method to be applied as perturbation technique to the molecule trapped in a distorted lattice structure. Results are given for molecules trapped in krypton and xenon. For the latter, both face-centered-cubic (fcc) and hexagonal-closed-packed (hcp) structures are shown to be possible. New harmonic and anharmonic constants are determined that allows calculation of matrix dependent calculated energy levels. It is shown that if distortion of the lattice is calculated for one isopotomer, then it can be used to calculate vibrational energies of other trapped isotopic species. Changes are more significant for harmonic potential constants than for third order anharmonic ones. Calculated energy levels compare well with observed ones. Predictions of unobserved ones for the latter isotope and other species are also made. The values calculated for 13C16O2 are consistent with LIF experimental results.

Published
2006

16. Fluorescence study of doubly excited states of molecular hydrogen

Author

Gazrcia E. Alvarez Ruiz J. Menmuir S. Rachlew E. Erman P. Kivimaki A. Glass-Maujean M. Richter R. Coreno M., Melero, Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Francois, Francoise, and Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA)

Published
2006

17. Weak overtone transitions of N2O around 1.05 µm by ICLAS-VECSEL

Author

Ding V. I. Perevalov S. A. Tashkun J.-L. Teffo S. Hu E. Bertseva A. Campargue., Y., Francois, Francoise, Laboratoire de Physique moléculaire et applications (LPMA), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Published
2006

19. The 2003 edition of the GEISA/IASI spectroscopic database

Author

A. Hamdouni, Claude Camy-Peyret, Michael Hess, Manfred Birk, M.R. Debacker-Barilly, V.I. Perevalov, Agnes Perrin, Noelle A. Scott, K.M. Smith, P. Köpke, P.-F. Coheur, Ludovic Daumont, Alain Chédin, Georg Wagner, N. Jacquinet-Husson, Aaron Goldman, Linda R. Brown, K. Garceran, A.A. Chursin, S.A. Tashkun, R. Armante, A. Barbe, Cathy Clerbaux, Steven T. Massie, Franz Schreier, Andrei Nikitin, J.-L. Teffo, Vl.G. Tyuterev, J.-Y. Mandin, Ch. Claveau, Jean-Marie Flaud, V. Dana, J. Vander Auwera, L. Régalia-Jarlot, A. Rublev, D. Jacquemart, Robert A. Toth, Semen Mikhailenko, Prasad Varanasi, V. Nemtchinov, I. Schult, D.A. Newnham, Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratory of Theoretical Spectroscopy [Tomsk] (LTS), V.E. Zuev Institute of Atmospheric Optics (IAO), Siberian Branch of the Russian Academy of Sciences (SB RAS)-Siberian Branch of the Russian Academy of Sciences (SB RAS), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), DLR Institut für Methodik der Fernerkundung / DLR Remote Sensing Technology Institute (IMF), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Denver], University of Colorado [Denver], Meteorologisches Institut München (MIM), Ludwig-Maximilians-Universität München (LMU), Laboratoire de Physique moléculaire et applications (LPMA), Stony Brook University [SUNY] (SBU), State University of New York (SUNY), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), Russian Research Center 'Kurchatov Institute', Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université Libre de Bruxelles [Bruxelles] (ULB), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
Atmospheric radiation, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Radiation, Database, Meteorology, GEISA/IASI, Infrared atmospheric sounding interferometer, computer.software_genre, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010309 optics, Depth sounding, remote sensing, 0103 physical sciences, Environmental science, Atmospheric absorption, HITRAN, spectroscopic database, 010306 general physics, computer, Spectroscopy, Web site, Remote sensing
Abstract

The content of the current 2003 version, GEISA/IASI-03, of the computer-accessible spectroscopic database, GEISA (Gestion et Etude des Informations Spectroscopiques Atmospheriques: Management and Study of Atmospheric Spectroscopic Information)/IASI (Infrared Atmospheric Sounder Interferometer) is described. The GEISA/IASI-03 system comprises three independent spectroscopic archives related with: an individual line transition spectroscopic parameters sub-database which contains 14 molecules, i.e.: H2O, CO2, O3, N2O, CO, CH4, O2, NO, SO2, NO2, HNO3, OCS, C2H2, N2, representing 51 isotopomers and 702,550 entries, in the spectral range 599-3001 cm-1; an absorption cross-sections sub-database which comprehends 6,572,329 entries related to 6 molecules, i.e.: CFC-11, CFC-12, CFC-14, HCFC-22, N2O5, CCl4; a catalog on micro-physical and optical properties of atmospheric aerosols, mainly refractive indices. The modifications and improvements, made since former editions in terms of database content and management, are detailed. GEISA/IASI is elaborated with the purpose of assessing the IASI (Infrared Atmospheric Sounding Interferometer: http://earth-sciences.cnes.fr/IASI/) measurements capabilities, within the ISSWG (IASI Sounding Science Working Group), in the frame of the CNES (Centre National d'Etudes Spatiales, France)/EUMETSAT (EUropean organization for the exploitation of METeorological SATellites) European Polar System (EPS) preparation. All the archived data can be handled though general and user friendly associated management software facilities, which are interfaced on the ARA (Atmospheric Radiation Analysis)/LMD (Laboratoire de Meteorologie Dynamique) group web site at: http://ara.lmd.polytechnique.fr.

Published
2005

20. 4-D comparison method to study the NOy partitioning in summer polar stratosphere – Influence of aerosol burden

Author

Dufour, G., Payan, S., Lefevre, F., Eremenko, M., Andre Butz, Jeseck, P., Te, Y., Pfeilsticker, K., Camy-Peyret, C., Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut für Umweltphysik [Heidelberg], Universität Heidelberg [Heidelberg], Laboratoire de Physique moléculaire et applications (LPMA), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Universität Heidelberg [Heidelberg] = Heidelberg University

Subjects
Stratosphère, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Chimie atmosphérique
Abstract

International audience; On 21–22 August 2001, NO, NO2 and HNO3 mixing ratio profiles were measured at high latitudes during sunset and sunrise using the Limb Profile Monitor of the Atmosphere (LPMA) and the DOAS experiments under stratospheric balloon. Photochemical simulations using the chemistry module of the Reprobus Chemistry Transport Model (CTM) that are constrained by ozone and total NOy balloon observations reproduce well the partitioning of NOx and NOy when model results are calculated at the exact time and location of the measurement for each tangent altitude. Taking the recently recommended reaction rate coefficients for the NOy partitioning (JPL-2003) and using realistic aerosol surface area in order to initialise the model leads to an agreement between calculations and measurements better than 10% all over the covered altitude range.

Published
2005

21. Une revue des techniques de mesure à distance et des problèmes de spectroscopie associés

Author

Claude Camy-Peyret, Sébastien Payan, Jerome de la Noe, Alain Hauchecorne, Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Sciences et Technologies - Bordeaux 1, and Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Materials science, Spectral signature, 010504 meteorology & atmospheric sciences, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Infrared, General Engineering, Energy Engineering and Power Technology, 01 natural sciences, 010309 optics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Remote sensing (archaeology), 0103 physical sciences, Spectral fitting, Spectroscopy, Absorption (electromagnetic radiation), Microwave, 0105 earth and related environmental sciences, Remote sensing
Abstract

Remote sensing based on quantitative spectroscopy is a powerful tool for precise measurements of atmospheric trace species concentrations, through the use of characteristic spectral signatures of the different molecular species and their associated vibration–rotation and electronic bands in the microwave, infrared, and UV-visible domains. A reliable retrieval of the concentration profiles requires a good characterisation of measurement and spectral fitting errors. This includes an accurate knowledge of spectroscopic parameters of all transition lines or absorption cross sections of interest since uncertainties lead to systematic retrieval errors; Les mesures à distances qui s'appuient sur la spectroscopie quantitative sont un outil puissant pour la mesure précise des concentrations d'espèces à l'état de trace dans l'atmosphère par l'utilisation des signatures spectrales caractéristiques des différentes espèces moléculaires, qui sont associées aux bandes de vibration–rotation et aux bandes électroniques dans les domaine micro-onde, infrarouge, et ultraviolet ou visible. Une inversion fiable du profil de concentration nécessite une bonne caractérisation des erreurs de mesure et d'ajustement des spectres. Ceci implique une connaissance précise des paramètres spectroscopiques de toutes les raies ou des sections efficaces d'absorption dont les incertitudes ont un impact direct sur les erreurs résultant de l'inversion des spectres observés.

Published
2005

22. The HITRAN 2004 molecular spectroscopic database

Author

Rothman, L. S., Jacquemart, D., Barbe, A., Benner, D. C., Birk, M., Brown, L. R., Carleer, M. R., Chackerian, C., Chance, K., Coudert, L. H., Dana, V., Devi, V. M., Flaud, J. M., Gamache, R. R., Goldman, A., Hartmann, J. M., Jucks, K. W., Maki, A. G., Mandin, J. Y., Massie, S. T., Orphal, J., Perrin, A., Rinsland, C. P., Smith, M. A. H., Tennyson, J., Tolchenov, R. N., Toth, R. A., Vander Auwera, J., Varanasi, P., Wagner, G., Atomic and Molecular Physics Division [Cambridge] (AMP), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge]-Smithsonian Institution-Harvard University [Cambridge], Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Department of Physics, The College of William and Mary, College of William and Mary [Williamsburg] (WM), DLR Institut für Methodik der Fernerkundung / DLR Remote Sensing Technology Institute (IMF), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), NASA Ames Research Center (ARC), Laboratoire de Photophysique Moléculaire (PPM), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Department of Environmental, Earth, and Atmospheric Sciences [Lowell], University of Massachusetts [Lowell] (UMass Lowell), University of Massachusetts System (UMASS)-University of Massachusetts System (UMASS), Department of Physics [Denver], University of Colorado [Denver], Smithsonian Institution-Harvard University [Cambridge], Laboratoire de Physique moléculaire et applications (LPMA), National Center for Atmospheric Research [Boulder] (NCAR), Center for Atmospheric Sciences [Hampton] (CAS), Hampton University, Department of Physics and Astronomy [UCL London], University College of London [London] (UCL), Stony Brook University [SUNY] (SBU), State University of New York (SUNY), Harvard University-Smithsonian Institution-Harvard University-Smithsonian Institution, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and Harvard University-Smithsonian Institution

Subjects
Aerosols, Radiation, Spectroscopic database, 010504 meteorology & atmospheric sciences, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], HITRAN, spectroscopic database, molecular spectroscopy, molecular absorption, line parameters, absorption cross-sections, aerosols, SELF-BROADENING COEFFICIENTS, ABSOLUTE LINE-INTENSITIES, FOURIER-TRANSFORM SPECTROSCOPY, ABSORPTION CROSS-SECTIONS, DIODE-LASER SPECTROSCOPY, FAR-INFRARED SPECTRUM, MULTISPECTRUM FITTING PROCEDURE, PRESSURE-SHIFT COEFFICIENTS, EFFECTIVE DIPOLE-MOMENT, MU-M REGION, 01 natural sciences, Molecular spectroscopy, Atomic and Molecular Physics, and Optics, Fernerkundung, 010309 optics, Line parameters, Molecular absorption, HITRAN, 0103 physical sciences, spektroskopische Datenbasis, Absorption cross-sections, Spectroscopy, 0105 earth and related environmental sciences
Abstract

This paper describes the status of the 2004 edition of the HITRAN molecular spectroscopic database. The HITRAN compilation consists of several components that serve as input for radiative transfer calculation codes: individual line parameters for the microwave through visible spectra of molecules in the gas phase; absorption cross-sections for molecules having dense spectral features, i.e., spectra in which the individual lines are unresolvable; individual line parameters and absorption cross-sections for bands in the ultra-violet; refractive indices of aerosols; tables and files of general properties associated with the database; and database management software. The line-by-line portion of the database contains spectroscopic parameters for 39 molecules including many of their isotopologues.The format of the section of the database on individual line parameters of HITRAN has undergone the most extensive enhancement in almost two decades. It now lists the Einstein A-coefficients, statistical weights of the upper and lower levels of the transitions, a better system for the representation of quantum identifications, and enhanced referencing and uncertainty codes. In addition, there is a provision for making corrections to the broadening of line transitions due to line mixing. (C) 2005 Elsevier Ltd. All rights reserved.

Published
2005

23. Contribution to Color Evaluation in Indexing Context

Author

Paris, Stéfane, Chabbi, H., Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Paris, Stéfane

Subjects
[INFO.INFO-CV] Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], [INFO.INFO-TI] Computer Science [cs]/Image Processing [eess.IV], [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], [INFO.INFO-IT] Computer Science [cs]/Information Theory [cs.IT], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2003

27. Validation of ozone measurements from the Improved Limb Atmospheric Spectrometer

Author

K. Shibasaki, H. Küllmann, Jean-Baptiste Renard, Yutaka Kondo, Takafumi Sugita, Hideaki Nakane, Vladimir Yushkov, P. Jeseck, Klaus Pfeilsticker, Kenneth W. Jucks, Isao Murata, G. C. Toon, Hans Schlager, D. G. Johnson, Yasuhiro Sasano, Sébastien Payan, James J. Margitan, Sophie Godin, Jean-Pierre Pommereau, H. Bremer, Hartwig Gernandt, R. Fitzenberger, Florence Goutail, Hiroshi Fukunishi, Claude Camy-Peyret, Hideaki Nakajima, B. Stachnik, Hartmut Bösch, M. von König, Hiroshi Kanzawa, Wesley A. Traub, Terry Deshler, Tatsuya Yokota, National Institute for Environmental Studies (NIES), Alfred Wegener Institute for Polar and Marine Research (AWI), Central Aerological Observatory (CAO), Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet), Kokugakuin University, Department of Atmospheric Science [Laramie], University of Wyoming (UW), Research Center for Advanced Science and Technology [Tokyo] (RCAST), The University of Tokyo (UTokyo), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et chimie de l'environnement (LPCE), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut für Umweltphysik [Heidelberg], Universität Heidelberg [Heidelberg], Institut für Umweltphysik [Bremen] (IUP), Universität Bremen, DLR Institut für Physik der Atmosphäre (IPA), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge], NASA Langley Research Center [Hampton] (LaRC), Department of Geophysics [Sendai], Tohoku University [Sendai], Kokugakuin University [Tokyo], Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Universität Heidelberg [Heidelberg] = Heidelberg University, and Harvard University-Smithsonian Institution

Subjects
Atmospheric Science, Ozone, 010504 meteorology & atmospheric sciences, Meteorology, O3, Soil Science, Aquatic Science, Oceanography, Atmospheric sciences, 01 natural sciences, Occultation, 010309 optics, chemistry.chemical_compound, Geochemistry and Petrology, 0103 physical sciences, Earth and Planetary Sciences (miscellaneous), vaildation, ILDAS, Stratosphere, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Observational error, Stratospheric Aerosol and Gas Experiment, Ecology, Spectrometer, Paleontology, solar occultation, Forestry, Aerosol, ozone, Geophysics, chemistry, 13. Climate action, Space and Planetary Science, stratosphere, Environmental science, Satellite
Abstract

International audience; Vertical profiles of ozone concentration in the high latitudes were observed by the Improved Limb Atmospheric Spectrometer (ILAS) aboard the Advanced Earth Observing Satellite (ADEOS) from November 1996 to June 1997. The ozone data obtained by the version 5.20 ILAS retrieval algorithm are compared with those obtained by the version 19 Halogen Occultation Experiment (HALOE), the version 6 Stratospheric Aerosol and Gas Experiment (SAGE) II, and the version 6 Polar Ozone and Aerosol Measurement (POAM) II retrieval algorithms. The ILAS data are also compared with ozone data measured by ozonesondes, instruments on board balloons or an aircraft, and ground-based instruments. The ILAS ozone data generally agree with its correlative data between 11 and 64 km with some exceptions. Quantitatively, the median value of the relative difference (absolute difference divided by its mean value) for these comparisons was within ±10%. Relative differences (18%) exceeding the combined measurement errors were found around 45–55 km altitude from comparisons with the HALOE and SAGE II data in January 1997 in the Southern Hemisphere (SH). Larger relative differences (around 50%) were also found below 15 km from comparisons with the HALOE and POAM II data in November 1996 in the SH, but these absolute differences were 0.10–0.16 ppmv as the median value. The ozone data processed by the version 5.20 were improved compared to the former version 3.10, which is available to the general public. The version 5.20 ozone data can be used for scientific analysis purposes based on the accuracy of the data in comparison with these other instruments.

Published
2002

28. Validation of NO2 and HNO3 measurements from the Improved Limb Atmospheric Spectrometer (ILAS) with the version 5.20 retrieval algorithm

Author

David G. Johnson, Kenneth W. Jucks, Hermann Oelhaf, Takakiyo Nakazawa, Farahnaz Khosrawi, Yasuhiro Sasano, Gerald Wetzel, Shuji Aoki, Hitoshi Irie, Hiroshi Kanzawa, Bhaswar Sen, G. C. Toon, Hideaki Nakajima, Rolf Müller, Andreas Engel, Wesley A. Traub, Tatsuya Yokota, Takafumi Sugita, Solar-Terrestrial Environment Laboratory [Nagoya] (STEL), Nagoya University, Research Center for Advanced Science and Technology [Tokyo] (RCAST), The University of Tokyo (UTokyo), Department of Earth and Planetary Sciences [TITECH Tokyo], Tokyo Institute of Technology [Tokyo] (TITECH), Atmospheric and Environmental Research, Inc. (AER), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Naval Research Laboratory (NRL), NASA Langley Research Center [Hampton] (LaRC), Laboratoire de physique et chimie de l'environnement (LPCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), National Institute for Environmental Studies (NIES), and Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, Instrumentation, Soil Science, Aquatic Science, Oceanography, 01 natural sciences, 010305 fluids & plasmas, Altitude, Geochemistry and Petrology, 0103 physical sciences, Earth and Planetary Sciences (miscellaneous), Stratosphere, Retrieval algorithm, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, Remote sensing, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Ecology, Spectrometer, Northern Hemisphere, Paleontology, Forestry, On board, Geophysics, 13. Climate action, Space and Planetary Science, Environmental science, Satellite
Abstract

[1] Measurements of CFC-12 were made by the Improved Limb Atmospheric Spectrometer (ILAS) between 57°N and 72°N in the Northern Hemisphere and between 64°S and 89°S in the Southern Hemisphere. ILAS was launched on 17 August 1996 on board the Advanced Earth Observing Satellite (ADEOS). The ILAS validation balloon campaigns were carried out from Kiruna, Sweden (68°N, 21°E), in February and March 1997 and from Fairbanks, Alaska (65°N, 148°W), in April and May 1997. During these validation balloon campaigns, CFC-12 was measured with the in situ instruments ASTRID, BONBON, and SAKURA and the remote sensing spectrometers MIPAS-B, FIRS-2, and MkIV. ILAS version 6.0 CFC-12 profiles obtained at the nearest location to the validation balloon measurement are compared with these validation balloon measurements. The quality of ILAS CFC-12 data processed with the version 6.0 algorithm improved significantly compared to previous versions. Low relative differences between ILAS CFC-12 and the correlative measurements of about 10% were found between 13 and 20 km. The comparison of vertical profiles shows that ILAS CFC-12 data are useful below about 20–22 km inside the vortex and below about 25 km outside the vortex. However, at greater altitudes the relative percentage difference increases very strongly with increasing altitude. Further, correlations of CFC-12 with N2O show a good agreement with the correlative measurements for N2O values of N2O > 150 ppbv. In summary, ILAS CFC-12 data are now suitable for scientific studies in the lower stratosphere.

Published
2002

29. Shifting and broadening in the fundamental band of CO highly diluted in He and Ar: A comparison with theory

Author

Jean-Pierre Bouanich, Christian Boulet, Franck Thibault, J. Boissoles, Jean-Michel Hartmann, Jean-Michel Launay, Caiyan Luo, James R. Drummond, Richard Wehr, A. D. May, Austrian Institute of Technology [Vienna] (AIT), Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), European Organization for Nuclear Research (CERN), Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Photophysique Moléculaire (PPM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS]Physics [physics], [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Atmospheric physics, 010304 chemical physics, Chemistry, Isotropy, Empirical modelling, General Physics and Astronomy, Rotational–vibrational spectroscopy, 01 natural sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], 0103 physical sciences, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, Anisotropy, ComputingMilieux_MISCELLANEOUS, Doppler broadening
Abstract

We present measurements of the shifts and widths of the rovibrational lines of the fundamental band of CO highly diluted in He and Ar at 296 K. The shifts are decomposed into parts odd and even in the line number, m. These are then compared with close coupled calculations carried out with the best known interaction potentials. There is general agreement between the calculated and measured values of the broadening and shifting. Furthermore, the results illustrate that the decomposition of the shifts into parts, odd and even in m, is a powerful tool for separating out the relative contributions of the isotropic and anisotropic part of the interaction to the shifts and which part needs to be corrected if there is a discrepancy. Thus, shift measurements can be added to the list of experiments that may be used to determine reliable interaction potentials. The results also show, given a potential, that close coupled calculations are accurate and could be used to confirm or establish empirical models of the temperature dependence of the broadening or shifting, etc. Such modeling is important at atmospheric physics.

Published
2001

30. 13C(16)O(2): Global Treatment of Vibrational-Rotational Spectra and First Observation of the 2nu(1) + 5nu(3) and nu(1) + 2nu(2) + 5nu(3) Absorption Bands

Author

S.A. Tashkun, J.-L. Teffo, D. Bailly, V.I. Perevalov, Mark P. Esplin, T.R. Huet, M. Lecoutre, Alain Campargue, Laboratory of Theoretical Spectroscopy [Tomsk] (LTS), V.E. Zuev Institute of Atmospheric Optics (IAO), Siberian Branch of the Russian Academy of Sciences (SB RAS)-Siberian Branch of the Russian Academy of Sciences (SB RAS), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), LAsers, Molécules et Environnement (LAME-LIPhy), Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), ONERA - The French Aerospace Lab [Meudon], and ONERA-Université Paris Saclay (COmUE)

Subjects
Physics, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], 010304 chemical physics, Extrapolation, Infrared spectroscopy, Eigenfunction, 01 natural sciences, Atomic and Molecular Physics, and Optics, Standard deviation, Spectral line, 010309 optics, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, symbols.namesake, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], 0103 physical sciences, symbols, HITRAN, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Physical and Theoretical Chemistry, Atomic physics, Hamiltonian (quantum mechanics), Photoacoustic spectroscopy, Spectroscopy, ComputingMilieux_MISCELLANEOUS
Abstract

The effective operator approach is applied to the calculation of both line positions and line intensities of the (13)C(16)O(2) molecule. About 11 000 observed line positions of (13)C(16)O(2) selected from the literature have been used to derive 84 parameters of a reduced effective Hamiltonian globally describing all known vibrational-rotational energy levels in the ground electronic state. The standard deviation of the fit is 0.0015 cm(-1). The eigenfunctions of this effective Hamiltonian have then been used in fittings of parameters of an effective dipole-moment operator to more than 600 observed line intensities of the cold and hot bands covering the nu(2) and 3nu(2) regions. The standard deviations of the fits are 3.2 and 12.0% for these regions, respectively. The quality of the fittings and the extrapolation properties of the fitted parameters are discussed. A comparison of calculated line parameters with those provided by the HITRAN database is given. Finally, the first observations of the 2nu(1) + 5nu(3) and nu(1) + 2nu(2) + 5nu(3) absorption bands by means of photoacoustic spectroscopy (PAS) is presented. The deviations of predicted line positions from observed ones is found to be less than 0.1 cm(-1), and most of them lie within the experimental accuracy (0.007 cm(-1)) once the observed line positions are included in the global fit. Copyright 2000 Academic Press.

Published
2000

31. Experimental and theoretical study of line mixing in methane spectra. IV. Influence of the temperature and of the band

Author

D. Pieroni, Alain Valentin, Jean-Paul Champion, Jean-Michel Hartmann, C. Claveau, C. Brodbeck, Nguyen-Van-Thanh, Tony Gabard, J. L. Domenech, Dionisio Bermejo, Laboratoire de Photophysique Moléculaire (PPM), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique de l'Université de Bourgogne (LPUB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Photophysique Moléculaire ( PPM ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique de l'Université de Bourgogne ( LPUB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Instituto de Estructura de la Materia ( IEM ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ), Laboratoire de Physique Moléculaire et Applications, UPR 136 CNRS ( LPMA ), Université Pierre et Marie Curie - Paris 6 ( UPMC ), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Spectral shape analysis, 010304 chemical physics, Infrared, Chemistry, Analytical chemistry, General Physics and Astronomy, Infrared spectroscopy, Quantum number, 01 natural sciences, Molecular physics, Spectral line, 13. Climate action, 0103 physical sciences, Physical and Theoretical Chemistry, 010306 general physics, Absorption (electromagnetic radiation), Mixing (physics), Line (formation)
Abstract

The infrared bands line-mixing effects of methane perturbed by nitrogen were discussed at different pressures. The spectral shapes of the ν2, ν4 and ν3 bands were compared at room temperature while the ν3 region was employed for the investigation of thermal effects. The effects of collisions in the ν4 region's spectra were calculated at the room temperature. The Coriolis coupling between ν2 and ν4 vibrational states resulted in the failure of evolution modeling with increasing pressure of absorption.© 2000 American Institute of Physics

Published
2000

32. The 1997 spectroscopic GEISA databank

Author

L. Rosenmann, K.M. Smith, A. Goldman, Alain Chédin, John E. A. Selby, Guy Guelachvili, Štěpán Urban, Noelle A. Scott, L. N. Sinitsa, J.C. Hilico, Geoffrey Duxbury, G. Graner, Laurence S. Rothman, A.M. Smith, Alain Barbe, N. Jacquinet-Husson, B. Bonnet, J. M. Sirota, Semen Mikhailenko, D.A. Newnham, Gordon L. Bjoraker, Claude Camy-Peyret, Jean-Marie Flaud, Alexei A. Chursin, Vl. Golovko, J. Ballard, André Fayt, Olga V. Naumenko, Johannes Orphal, Vl.G. Tyuterev, Cathy Clerbaux, E. Arie, Jean-Paul Champion, Agnes Perrin, Andrei Nikitin, Jean-Michel Hartmann, D. Reuter, Linda R. Brown, Emmanuel Lellouch, Robert R. Gamache, Prasad Varanasi, V. Nemtchinov, Curtis P. Rinsland, N. Fourrié, J. Hillman, Mark Weber, Guillaume Lefèvre, R. H. Tipping, Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), GSFC Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center (GSFC), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Laboratoire de Physique de l'Université de Bourgogne (LPUB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), V.E. Zuev Institute of Atmospheric Optics (IAO), Siberian Branch of the Russian Academy of Sciences (SB RAS), Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Physique Moléculaire [Bruxelles], Université libre de Bruxelles (ULB), Department of Physics and Applied Physics [Glasgow], University of Strathclyde [Glasgow], Laboratoire de Spectroscopie Moléculaire, Université Catholique de Louvain = Catholic University of Louvain (UCL), Department of Environmental, Earth, and Atmospheric Sciences [Lowell], University of Massachusetts [Lowell] (UMass Lowell), University of Massachusetts System (UMASS)-University of Massachusetts System (UMASS), Department of Physics [Denver], University of Colorado [Denver], Departement de recherche SPAtiale (DESPA), Observatoire de Paris, Stony Brook University [SUNY] (SBU), State University of New York (SUNY), Institute of Environmental Physics [Bremen] (IUP), University of Bremen, Laboratoire de Photophysique Moléculaire (PPM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), NASA Langley Research Center [Hampton] (LaRC), Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion (EM2C), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université Paris Saclay (COmUE), Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), and Université Paris Saclay (COmUE)-Centre National de la Recherche Scientifique (CNRS)-CentraleSupélec

Subjects
Physics, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Radiation, 010504 meteorology & atmospheric sciences, 0103 physical sciences, Astronomy, 010303 astronomy & astrophysics, 01 natural sciences, Spectroscopy, Atomic and Molecular Physics, and Optics, Spectral line, 0105 earth and related environmental sciences, Web site
Abstract

International audience; The current version GEISA-97 of the computer-accessible database system GEISA (Gestion et Etude des Informations Spectroscopiques Atmosphériques: Management and Study of Atmospheric Spectroscopic Information) is described. This catalogue contains 1,346,266 entries. These are spectroscopic parameters required to describe adequately the individual spectral lines belonging to 42 molecules (96 isotopic species) and located between 0 and 22,656 cm-1. The featured molecules are of interest in studies of the terrestrial as well as the other planetary atmospheres, especially those of the Giant Planets. GEISA-97 contains also a catalog of absorption cross-sections of molecules such as chlorofluorocarbons which exhibit unresolvable spectra. The modifications and improvements made to the earlier edition (GEISA-92) and the data management software are described. GEISA-97 and the associated management software are accessible from the ARA/LMD (Laboratoire de Météorologie Dynamique du CNRS, France) web site: http://ara01.polytechnique.fr/registration.

Published
1999

33. Experimental and theoretical study of line mixing in methane spectra. II. Influence of the collision partner (He and Ar) in the nu3 IR band

Author

D. Pieroni, M. V. Tonkov, J. L. Domenech, Alain Valentin, R. Le Doucen, Jean-Paul Champion, Jean-Michel Hartmann, Nguyen-Van-Thanh, Tony Gabard, C. Brodbeck, I. M. Grigoriev, C. Claveau, Dionisio Bermejo, Laboratoire de Photophysique Moléculaire (PPM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de l'Université de Bourgogne (LPUB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Instituto de Estructura de la Materia (IEM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Physique des atomes, lasers, molécules et surfaces (PALMS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Institute of Physics, St. Petersburg State University, St Petersburg State University (SPbU), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Laboratoire de Photophysique Moléculaire ( PPM ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique de l'Université de Bourgogne ( LPUB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Instituto de Estructura de la Materia ( IEM ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ), Laboratoire de Physique Moléculaire et Applications, UPR 136 CNRS ( LPMA ), Université Pierre et Marie Curie - Paris 6 ( UPMC ), Physique des atomes, lasers, molécules et surfaces ( PALMS ), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Centre National de la Recherche Scientifique ( CNRS ), and St Petersburg State University ( SPbU )

Subjects
Argon, Spectral shape analysis, 010304 chemical physics, General Physics and Astronomy, chemistry.chemical_element, Semiclassical physics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Quantum number, 01 natural sciences, Spectral line, Quality (physics), chemistry, 0103 physical sciences, Physical and Theoretical Chemistry, Atomic physics, 0210 nano-technology, Mixing (physics), Line (formation)
Abstract

Line mixing effects are studied in the v3 band of CH4 perturbed by Ar and He at room temperature. Experiments have been made in the 2800-3200 cm-1 spectral region using four different setups. They cover a wide range of total densities, including low (0.25-2 atm), medium (25-100 atm), and high (200-1000 atm) pressure conditions. Analysis of the spectra demonstrates that the spectral shapes (of the band, the Q branch, the P and R manifolds,...) are significantly influenced by line mixing. The theoretical approach proposed in the preceding paper is used in order to model and analyze these effects. As done previously, semiclassical state-to-state rates are used together with a few empirical constants. Comparisons between measurements and spectra computed with and without the inclusion of line mixing are made. They prove the quality of the approach which satisfactorily accounts for the effects of pressure and of rotational quantum numbers on the spectral shape. It is shown that collisions with He and Ar lead to different line-coupling schemes (e.g., more coupling within the branches and less between branches) and hence to different shapes. The influence of line coupling between different branches and manifolds is evidenced and studied using high pressure spectra and absorption in the band wings. © 1999 American Institute of Physics.

Published
1999

34. Experimental and theoretical study of line mixing in methane spectra. I. The N2-broadened nu3 band at room temperature

Author

Nguyen-Van-Thanh, Tony Gabard, Jean-Michel Hartmann, C. Claveau, C. Brodbeck, D. Pieroni, Dionisio Bermejo, J. L. Domenech, Alain Valentin, Jean-Paul Champion, Laboratoire de Physique Moléculaire et Applications, UPR 136 CNRS, Orsay ( LPMA/Orsay ), Université Paris-Sud - Paris 11 ( UP11 ), Laboratoire de Physique Moléculaire et Applications, UPR 136 CNRS ( LPMA ), Université Pierre et Marie Curie - Paris 6 ( UPMC ), Laboratoire de Physique de l'Université de Bourgogne ( LPUB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Instituto de Estructura de la Materia ( IEM ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de l'Université de Bourgogne (LPUB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Instituto de Estructura de la Materia (IEM), and Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)

Subjects
010304 chemical physics, Chemistry, Analytical chemistry, General Physics and Astronomy, Semiclassical physics, Infrared spectroscopy, 01 natural sciences, Measure (mathematics), Spectral line, 3. Good health, Quality (physics), 0103 physical sciences, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, Absorption (electromagnetic radiation), Mixing (physics), Line (formation)
Abstract

Line-mixing effects have been studied in the ν3 band of CH4 perturbed by N2 at room temperature. New measurements have been made and a model is proposed which is not, for the first time, strictly empirical. Three different experimental set ups have been used in order to measure absorption in the 2800-3200 cm-1 spectral region for total pressures in the 0.25-2 and 25-80 atm ranges. Analysis of the spectra demonstrates the significant influence of line mixing on the shape of the Q branch and of the P and R manifolds. A model is proposed which is based on state-to-state collisional transfer rates calculated from the intermolecular potential surface with a semiclassical approach. The line-coupling relaxation matrix is constructed from these data and two additional parameters which are fitted on measured absorption. Comparisons between measurements and spectra computed accounting for and neglecting line mixing are made. They prove the quality of the approach which satisfactory accounts for the effects of pressure and of rotational quantum numbers on the spectral shape under conditions where modifications introduced by line mixing are important. For high rotational quantum number lines, the main features induced by collisions are predicted but some discrepancies remain; the latter may be due to improper line-coupling elements but there is strong evidence that the use of inaccurate line broadening parameters also contributes to errors in calculated spectra. © 1999 American Institute of Physics.

Published
1999

35. ABSORPTION INTENSITIES, PRESSURE-BROADENING AND LINE MIXING PARAMETERS OF SOME LINES OF NH3 IN THE ν4 BAND

Author

M. Broquier, S. Gherissi, A. Picard-Bersellini, H. Aroui, M. Chevalier, Jean-Pierre Bouanich, Ecole Supérieure des Sciences et Techniques [Tunis] (ESSTT), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Photophysique Moléculaire (PPM), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Radiation, Materials science, 010304 chemical physics, Antisymmetric relation, Resolution (electron density), Quantum number, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010309 optics, Absorbance, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Nuclear magnetic resonance, 0103 physical sciences, Quadrupole, Atomic physics, Absorption (electromagnetic radiation), Spectroscopy, Mixing (physics), ComputingMilieux_MISCELLANEOUS, Line (formation)
Abstract

The intensities and foreign gas broadening coefficients of 57 selected lines of the ν 4 band of NH 3 have been measured in the region of 1550 cm -1 using a high resolution Brucker Fourier transform spectrometer. The line intensities were obtained by using the methods of absorbance at the line center and by fitting Voigt profiles to the measured shapes of the lines. The latter method also provides the collisional widths of the lines. In addition, collision cross relaxation coefficients of O 2 and air foreign gases were measured for 9 doublets of NH 3 in the ν 4 band. The J and K quantum numbers dependencies of pressure-broadening coefficients and line intensities are discussed. The observed air broadening and cross relaxation coefficients were found to be in reasonable quantitative agreement with the concentration-weighted average of the N 2 and O 2 broadening coefficients. The comparison of our present and previous results obtained for the NH 3 –H 2 , NH 3 –air, NH 3 –N 2 and NH 3 –CO 2 collisions shows an increase of the pressure broadening and cross relaxation coefficients with quadrupole moment of the foreign gas. The analysis of the line intensities was based on the third-order theory of line strengths and yields effective transition moments, vibrational band strengths and correction parameters of the symmetric and antisymmetric partial bands of the fundamental ν 4 band.

Published
1998

36. Vibrational stimulated emission of CO in solid argon

Author

Chabbi, H., Dahoo, Pierre-Richard, Gauthier-Roy, B., Vasserot, A., Abouaf-Marguin, L., Broquier, M., Dubost, H., Kolos, R., Tramer, A., Berset, J. M., Ortega, J.M., Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Photophysique Moléculaire (PPM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation du rayonnement électromagnétique (LURE), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-MENRT-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1998

37. Selection Rules and Intensity Calculations for a Cs Asymmetric Top Molecule Containing a Methyl Group Internal Rotor

Author

Isabelle Kleiner, Jon T. Hougen, Michel Godefroid, National Institute of Standards and Technology [Gaithersburg] (NIST), Laboratoire de Physique moléculaire et applications (LPMA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and Université libre de Bruxelles (ULB)

Subjects
Physics, 010304 chemical physics, Plane symmetry, Symmetry group, 010402 general chemistry, Rotation, 01 natural sciences, Atomic and Molecular Physics, and Optics, Euler's rotation theorem, 0104 chemical sciences, Rotational energy, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Theoretical physics, symbols.namesake, 0103 physical sciences, Molecular symmetry, symbols, Physical and Theoretical Chemistry, Symmetry (geometry), Spectroscopy, Plane of rotation
Abstract

International audience; A detailed discussion is presented of the relationships between four different molecular symmetry groups. i.e.. D2, Cs, C3v, and C(m)3v commonly used to discuss energy level symmetry species and electric-dipole selection rules for internal rotor problems in molecules with a symmetric rotor top and a frame with a plane of symmetry. paying particular attention to confusion arising from the fact that the smaller groups are not always subgroups of the larger, and the groups are applied to different parts of the internal rotation problem (i.e., D2 to pure rotation, Cs to vibration-rotation, C3v and C(m)3v to torsion-rotation). The meaning in this context of the traditional Ka, Kc labels for rotational energy levels in molecules with internal rotation is examined in detail. A discussion is also given of the relationship between three different schemes for defining a molecule-fixed axis system in internal rotation problems. i.e., the principal axis method, the internal axis method, and a hybrid method referred to here as the "rho axis method," paying particular attention to the meaning of a-type, b-type, and c-type transitions when using each of these axis systems. Some of the above ideas were helpful in adding intensity calculations to our earlier computer program treating internal rotation and overall rotation in acetaldehyde-like molecules, and these intensity calculations are also briefly discussed.

Published
1994

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