15 results on '"RADIATIVE transitions"'
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2. High Precision Calculations for Helium
- Author
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Drake, Gordon W. F. and Drake, Gordon W. F., editor
- Published
- 2023
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3. On the effective vibrational temperature of the source using (2)3∏ - X3∏ system of GeC molecule.
- Author
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Sindhan, R., Bharathi, N. Venkatesh, and Ramaswamy, S.
- Subjects
RADIATIVE transitions ,EINSTEIN coefficients ,SOLAR atmosphere ,POTENTIAL energy ,MOLECULES ,OSCILLATOR strengths - Abstract
• The potential energy curve of electronic states have been estimated for the (2) 3 Π − X 3 Π transition of GeC molecule using RKR method. • The radiative transition parameters have been estimated for the (2) 3 Π − X 3 Π transition of GeC molecule. • The effective vibrational temperature helps to ascertain the presence of GeC molecule in sunspot atmosphere. In this work, the experimental potential energy curves for (2) 3 Π and X 3 Π electronic states of GeC molecule have been constructed by using Rydberg-Klein-Rees (RKR) method. The radiative transition parameters viz., Franck-Condon (FC) factor, r-centroid, electronic transition moment, band strength, relative band strength, Einstein coefficients, radiative lifetime and oscillator strength for the (2) 3 Π − X 3 Π system of GeC molecule have been estimated for the experimentally observed vibrational levels from Rydberg-Klein-Rees (RKR) potential and the estimated values are tabulated. The estimated effective vibrational temperature found as 5628 K for the (2) 3 Π − X 3 Π system of GeC molecule. The radiative transition parameters and effective vibrational temperature are evident that the possible presence of GeC molecule in solar and sunspots atmosphere. Further, these parameters are employed in rationalizations of astrochemical and astrophysical observations. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Solid-state effect on the luminescence mechanism of thermally activated delayed fluorescence with aggregation induced emission: A theoretical perspective.
- Author
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Yu, Ziyue, Sun, Yuping, Chen, Jiahui, Wei, Shuli, Chang, Qiang, Zhang, Tian, and Zhou, Aiping
- Subjects
DELAYED fluorescence ,LUMINESCENCE ,QUANTUM mechanics ,RADIATIVE transitions ,MOLECULAR shapes ,RADIATIONLESS transitions - Abstract
[Display omitted] • There are smaller energy gap, larger SOC and more limited geometric structure changes in solid-phase environment. • The effective ISC and RISC processes between S 1 and T 2 reveal the TADF mechanism of PyB-DPAC. • The superior AIE property benefits from the suppressed non-radiative process and enhanced radiative transition. An investigation of high-performance organic green thermally activated delayed fluorescence (TADF) material, PyB-DPAC, with aggregation-induced luminescence (AIE) characteristics was theoretically conducted by the first principle calculations method in this work. The polarizable continuum mode (PCM) and the combination of quantum mechanics and molecular mechanics (QM/MM) method were employed to consider the liquid-phase and solid-phase environments, respectively. Results show that TADF mechanism of the molecule is mainly due to the occurrence of efficient intersystem crossing (ISC) and reverse intersystem crossing (RISC) processes between S 1 and T 2 , which benefits from the small energy gap, large SOC and the limited changes of molecular geometry structures in solid-phase environment. The increase of radiative transition rate (K r) and significant decrease of non-radiative transition rate (K nr) is responsible for the AIE property. Our calculations reasonably explained the experimental results and showed that PyB-DPAC is an excellent TADF material with AIE characteristics, this may help to better understand the influence of solid-state effect and the luminescence mechanism of AIE-TADF molecules. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
5. Fluorescent Thermal Feedback in Ho3+/Yb3+ Doped Y2Ti2O7 Electrospun Nanofibers.
- Author
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Erkang Hu, Peijian Lin, Edwin Yue-Bun Pun, Jinliang Yuan, Hai Lin, and Xin Zhao
- Subjects
NANOFIBERS ,OPTICAL materials ,RADIATIVE transitions ,RARE earth metals ,MOLECULAR spectra ,DOPING agents (Chemistry) ,TITANIUM - Abstract
One-dimensional (1D) Y2Ti2O7 (YTO): Ho3+/Yb3+ nanofibers with diameters ranging from 300 to 400 nm were synthesized by an electrospinning technology and the structure of YTO nanofibers was identified as face-centered cubic pyrochlores. The detected green and red signals in the upconversion emission spectra under 980 nm laser excitation are due to the radiative transitions (5F4, 5S2) ? 5I8 and 5F5 = 5I8 of Ho3+ ions, respectively. YTO: Ho3+/Yb3+ nanofibers have the characteristics of porosity, threedimensional braidability, high specific surface area and controllable structure, which improves the performance of optical temperature sensing. Furthermore, the nanofiber membranes consisting of YTO: Ho3+/Yb3+ with temperature sensing performance can work steadily at medium temperature range in view of its fast responses and high stability, moreover, a maximum sensitivity about 0.18% K-1 at 423 K, which indicates that the nanofibers have good thermal sensitivity. 1D nanostructure rare earth iondoped cubic pyrochlore material was proven to obtain excellent upconversion luminescence properties, which provides a new route for the development of sensitive optical temperature-sensing materials. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
6. Electronic states, spectroscopic parameters, transition probabilities, and radiative lifetimes of the scandium monosulfide cation, ScS+: A theoretical contribution.
- Author
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Romeu, João Gabriel Farias and Ornellas, Fernando R.
- Subjects
PROBABILITY theory ,DIPOLE moments ,RADIATIVE transitions ,SCANDIUM ,POTENTIAL energy ,SINGLET state (Quantum mechanics) - Abstract
• As yet, experimentally unknown cationic species: ScS
+ . • Reliable characterization of excited electronic states. • Transition moments, transition probabilities, radiative lifetimes. • Should help plan and guide future experimental investigations. High-level CASSCF/MRCI calculations with cc-pV5Z basis sets were employed to characterize a manifold of electronic states of the monosulfide cation ScS+ correlating with the three-lowest dissociation channels. The global energetic picture provided by the potential energy curves makes evident a region, especially above 35,000 cm−1 , of high density of electronic states that presents a challenge for both experimentalists and computational chemists to assign properly the electronic transitions. For the lowest-lying singlet and triplet states, a whole set of spectroscopic parameters are provided. Additionally, data on dipole moment functions, transition dipole moment functions, radiative transition probabilities and lifetimes are also evaluated for a subset of singlet states, namely, X1 Σ+ , B1 Π, C1 Π, G1 Σ+ , H1 Π, I1 Π, and J1 Σ+ , for which we identified favorable transitions to be investigated experimentally. Our results are sufficiently accurate and reliable to guide and motivate spectroscopists to investigate further this species. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
7. Photon-Atom Interactions: Intermediate Energies
- Author
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Crasemann, Bernd and Drake, Gordon, editor
- Published
- 2006
- Full Text
- View/download PDF
8. Impact of Deep Soil Layer on Terrestrial Microwave Emission for a Bare Agricultural Field.
- Author
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DOGUSGEN, Cihan
- Subjects
MICROWAVES ,FARMS ,RADIATIVE transfer ,RADIATIVE transitions ,INCOHERENT scattering ,SOIL moisture ,BRIGHTNESS temperature ,MATHEMATICAL models - Abstract
In this study, we investigated the deep (semiinfinite) soil contribution to the brightness temperature at 1.4 GHz calculated through a modified incoherent radiative transfer model. We reproduced the measured brightness temperature collected by a dual L-band radiometer in a bare agricultural field. We found that exclusion of a semi-infinite soil layer in the incoherent model significantly decreased the brightness temperature when the measurement depth in the model was closer to the emitting depth, which is the first few centimeters from the top of soil. The maximum brightness temperature differences between the cases with and without the semi-infinite layer in the incoherent model were computed to be 6.8444 K, 2.8891 K, 0.2477 K and 0.0004 K for the measurement depths of 4 cm, 5 cm, 8 cm and 16 cm, respectively. Based on a comparison with another coherent radiative transfer model, we observed that inclusion of the deep soil layer significantly improved the precision of the incoherent model regardless of the measurement depth. Our results could be one example of improving the accuracy of radiative transfer models, which might be applied to other radiative transfer models and increase the precision of soil moisture retrieval calculations. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
9. Fourier Grid Hamiltonian Method for calculating the Einstein coefficients, Franck–Condon factors, r-Centroids, average internuclear separations and radiative lifetimes for N2 and CO molecules.
- Author
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Dixit, Mayank Kumar, Srivastava, Amar, and Tembe, B.L.
- Subjects
MOLECULAR physics ,HAMILTONIAN systems ,EINSTEIN coefficients ,QUANTUM transitions ,RADIATIVE transitions - Abstract
The Einstein coefficients and radiative lifetimes for diatomic molecules such as N 2 and CO have been computed using the Fourier Grid Hamiltonian (FGH) method and a comparison with other methods has been made. The Hamiltonian matrix is constructed using the Hulburt and Hirschfelder (HH) potential model and the Rydberg-Klein-Rees (RKR) potential model for diatomic molecules. The FGH method works well for any model of the potential including the tabulated forms of experimental potential energy data. The eigenvalues and vibrational wave-functions for the ground and the exited state of N 2 and CO molecules have been computed by diagonalizing the Hamiltonian matrix. The vibrational wave-functions and eigenvalues for the ground and the excited states are used to calculate the radiative transition parameters such as Einstein coefficients ( A v″v′ ), radiative lifetimes, electronic transition dipole moments (R e (x)), Franck–Condon factors (FCFs), r-Centroids and average internuclear separations for both the models. FGH method work well for both the models. There are good agreements between our computed values of radiative transition parameters for both the models and the values estimated by other methods. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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10. Spin State Transitions in RECoO3 Investigated by μ +SR.
- Author
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Sugiyama, Jun, Ikedo, Yutaka, Nozaki, Hiroshi, Mukai, Kazuhiko, Ansaldo, Eduardo J., Brewer, Jess H., Chow, Kim H., Takami, Tsuyoshi, and Ikuta, Hiroshi
- Subjects
NUCLEAR spin ,RADIATIVE transitions ,COBALT oxides ,MUON spin rotation ,PHYSICAL measurements ,PHYSICS experiments ,TRANSITION temperature - Abstract
Abstract: The spin-state of RECoO3(RE = La, Pr, Nd, and PrxLa1−x)has been investigated by μ
+ SR experiments. In particular, the muonic Knight shift in a high TF of 10 kOe was studied at temperatures below 300K. By combining these measurements with the dc-susceptibility data, the spin-state transition temperature(TSS )was found to increase monotonically as the average ionic radius of the RE ion is decreased. Our measurements demonstrate that TF-μ+ SR is a unique technique to detect the spin-state transition in compounds regardless of coexistence of large magnetic moments through the change in microscopic magnetic environments at TSS . [Copyright &y& Elsevier]- Published
- 2012
- Full Text
- View/download PDF
11. Indirect optical transitions from carriers trapped on the delta doping and on the parabolic quantum well.
- Author
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Tabata, A., Oliveira, J.B.B., Pint‹o, C.A.F., Silva, E.C.F. da, Lamas, T.E., Duarte, C.A., and Gusev, G.M.
- Subjects
RADIATIVE transitions ,SEMICONDUCTOR doping ,QUANTUM wells ,PHOTOLUMINESCENCE ,RADIATION trapping ,THICKNESS measurement ,GALLIUM arsenide - Abstract
Abstract: In this work, doped AlGaAs/GaAs parabolic quantum wells (PQW) with different well widths (from 1000Å up to 3000Å) were investigated by means of photoluminescence (PL) measurements. In order to achieve the 2DEG inside the PQW Si delta doping is placed at both side of the well. We have observed that the thickness of this space layer plays a major rule on the characteristics of the 2DEG. It has to be thicker enough to prevent any diffusions of Si to the well and thin enough to allow electrons migration inside the well. From PL measurement, we have observed beside the intra well transitions, indirect transitions involving still trapped electron on the delta doping and holes inside the PQW. For the thinness sample, we have measured a well defined PL peak at low energy side of the GaAs bulk emission. With the increasing of the well thickness this peak intensity decreases and for the thickest sample it almost disappears. Our theoretical calculation indicated that carriers (electron and holes) are more placed at the center of the PQW. In this way, when the well thickness increases the distance between electrons on the delta doping and holes on the well also increases, it decreases the probability of occurrence of these indirect optical transitions. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
12. Investigations of laser-driven radiative blast waves in clustered gases.
- Author
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Symes, D.R., Hohenberger, M., Lazarus, J., Osterhoff, J., Moore, A.S., Fäustlin, R.R., Edens, A.D., Doyle, H.W., Carley, R.E., Marocchino, A., Chittenden, J.P., Bernstein, A.C., Gumbrell, E.T., Dunne, Mike, Smith, R.A., and Ditmire, T.
- Subjects
RADIATIVE transitions ,BLAST effect ,MICROCLUSTERS ,ULTRASHORT laser pulses ,ABSORPTION ,SHOCK waves ,SIMULATION methods & models ,HYDRODYNAMICS - Abstract
Abstract: Radiative blast waves can be created by focusing intense laser pulses into highly absorbing clustered gases. By considering the plasma conditions these shocks can be categorized as optically thin radiative shocks, a regime of particular interest for laboratory astrophysics experiments. A periodic spatial modulation is introduced to the shock front in order to investigate instability and shock collisions. Hydrodynamic simulations are presented which are in qualitative agreement with the experimental results. A technique to perform a single shot measurement of the entire shock trajectory and the possibility to detect oscillations in the shock velocity is discussed. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF
13. Repeatability in radiative shock tube experiments.
- Author
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Doss, F.W., Drake, R.P., and Kuranz, C.C.
- Subjects
SHOCK tubes ,RADIATIVE transitions ,QUALITATIVE research ,QUANTITATIVE research ,X-rays ,HYDRODYNAMICS - Abstract
Abstract: We report here data gathered regarding radiative shock experiments carried out on October 23, 2008. This day featured a number of nominally identical experimental shots. We discuss the degree to which the shots qualitatively differed from one to another and to what degree quantitative measurements, such as shock position, proved to have repeatably obtainable values. In particular, we call attention to the use of radiative precursor-launched wall shocks as a diagnostic feature. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF
14. Analytical theory for the fluence, planar fluence, energy fluence, planar energy fluence and absorbed dose of primary particles and their fragments in broad therapeutic light ion beams.
- Author
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Kempe, J. and Brahme, A.
- Subjects
ION bombardment ,ENERGY dissipation ,MULTIPLE scattering (Physics) ,RADIATIVE transitions ,MONTE Carlo method ,ALPHA rays ,PROTONS ,ATOMIC weights - Abstract
Abstract: The purpose of the present work is to develop analytical expressions for the depth variation of the fluence, planar fluence, the energy fluence, planar energy fluence, the mean energy and absorbed dose of primary ions and their associated fragments in tissue-like media with ranges of clinical interest. The analytical expressions of the primary ions and associated fragments take into account nuclear interactions, energy losses, range straggling and multiple scattering. The analytical models of the radiation field quantities were compared with the results of the modified Monte Carlo (MC) code SHIELD-HIT
+ . The results show that the shape of the depth absorbed dose distribution of the primary particles is characterized by an increasingly steep exponential fluence decrease with depth as the charge and atomic weight increase. This is accompanied by a compensating increased energy loss towards the Bragg peak as the charge of the ion increases. These largely compensating mechanisms are the main reason that the depth absorbed dose curve of all light ions is surprisingly similar. In addition, a rather uniform dose in the plateau region is obtained since the increasing fragment production almost precisely compensates the loss of primaries. The dominating light fragments such as protons and alpha particles are characterized by longer ranges than the primaries and their depth dose curves to some extent coincide well with the depth fluence curves due to a rather slow variation of mean stopping powers. In contrast, the heavier fragments are characterized by the build up of a slowing down spectrum similar to that of the primaries but with initially slightly shorter or longer ranges depending on their mass to atomic number ratio. The presented analytical theory for the light ion penetration in matter agree quite well with the MC and experimental data and may be very useful for fast analytical calculations of quantities like mean energy, fluence, energy fluence, absorbed dose, and LET. [Copyright &y& Elsevier]- Published
- 2010
- Full Text
- View/download PDF
15. Structural, optical, electrical and morphological properties of CdS films deposited by CBD varying the complexing agent concentration.
- Author
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Moreno-Regino, V.D., Castañeda-de-la-Hoya, F.M., Torres-Castanedo, C.G., Márquez-Marín, J., Castanedo-Pérez, R., Torres-Delgado, G., and Zelaya-Ángel, O.
- Abstract
• CdS film's resistivity from 10
2 to 107 Ω-cm by increasing the NH 4 OH concentration. • Low NH 4 OH concentration leads to a higher presence of organic compounds in CdS films. • Lower presence of radiative defects in CdS films for the lowest NH 4 OH concentrations. • CdS films deposited by CBD for their use as window layer were obtained. CdS thin films were deposited on commercial glass substrates by CBD technique at constant temperature and deposition time of 90 °C and 50 min, respectively. The reaction was performed by mixing cadmium acetate, ammonium acetate, ammonium hydroxide, thiourea, and deionized water as an aqueous medium. The S/Cd ratio in the solution was kept constant at 4.46 to make sure that the films were as stoichiometric as possible. Optical, electrical, structural properties and the presence of organic compounds in the films were studied modifying the concentration of ammonium hydroxide (complexing agent) in the bath solution. X-ray diffraction patterns show that all films have the cubic phase with a preferential orientation in the plane (1 1 1). An increase of the film's resistivity from 102 to 107 Ω-cm is observed by increasing the ammonium hydroxide concentration in the solution in the narrow interval of 0.18–0.36 M. Transmittance values up to 70% are obtained at the lowest concentrations of this reagent, obtaining from these spectra the highest value of the direct bandgap, 2.37 eV. Results about the presence of organic compounds and their influence on the photoluminescence properties are shown, which have not been reported to date. The main organic compound identified by FTIR is cyanamide, whose concentration is higher at the lowest ammonium hydroxide concentrations. Photoluminescence spectra of the films show green, red and orange bands, located at 2.27 eV, 1.78 eV, and 2.02 eV, respectively. An additional band was observed with low intensity at 2.99 eV associated with the presence of nanoparticles in some films. The films with the lower presence of defects, higher uniformity and best optical, electrical and structural properties for their use as window material in solar cells are those deposited from a bath solution with a 0.24 M concentration of the complexing agent. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
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