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51. Nanostructured silicon films obtained by neutral cluster depositions.

Author

Melinon, P., Keghelian, P., Prevel, B., Perez, A., Guiraud, G., LeBrusq, J., Lerme, J., Pellarin, M., and Broyer, M.

Subjects
MICROCLUSTERS, THIN films, SILICON
Abstract

Studies nanosize neutral silicon clusters produced using a laser vaporization source in the gas phase and deposited on various substrates. Characterization of the nanostructured thin films; Comparison of film properties with those of a disordered phase; Interpretation of features in the clusters on the basis of quantum confinement effects.

Published
1997

52. Study of bimetallic Pd–Pt clusters in both free and supported phases.

Author

Rousset, J. L., Cadrot, A. M., Cadete Santos Aires, F. J., Renouprez, A., Mélinon, P., Perez, A., Pellarin, M., Vialle, J. L., and Broyer, M.

Subjects
PLATINUM, PALLADIUM, LAMINATED metals
Abstract

We study PdPt bimetallic clusters in both free and supported phases. These clusters have been produced with a laser vaporization source. Free clusters directly produced by the source are studied by time of flight mass spectrometry and photofragmentation technique. We observed a sequential evaporation of Pd atoms in the mixed clusters consistent with a palladium segregation process. This tendency has been also observed on supported particles from which the structure and the composition are determined by high resolution transmission electron microscopy and energy dispersive x-ray analysis. A main result is that each particle has the composition of the massic rod vaporized in the source. The supported particles are well crystallized and exhibit truncated octahedron shapes. Experimental observations are well explained using a modified tight binding model. Indeed, within this model, we found that the equilibrium shape is strongly related to the variation of the cohesive energy with atomic coordination number. Also, some preliminary results on the specific reactivity of these bimetallic clusters are presented. © 1995 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
1995
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54. Plasmonic sensing of the chemical reactivity of bimetallic nanoparticles: a new setup for high-sensitivity optical measurements under controlled environment

Author

RAMADE, J., Pellarin, M., Bourgey, A., Cottancin, E., Piccolo, L., Langlois, Cyril, LEBEAULT, M.A., Mosset, A., RAFFINAGE (RAFFINAGE), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [SDE.ES] Environmental Sciences/Environmental and Society, [CHIM.CATA]Chemical Sciences/Catalysis, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

National @ RAFFINAGE+LPI; International audience; Due to their high surface to volume ratio, metallic nanoparticles (NPs) exhibit specific properties, as for example a huge optical absorption resonance (the so-called Surface Plasmon Resonance (SPR)), depending on the nature of the metal. Furthermore, simple structural or local environment changes of these NPs can bring about large modifications (spectral shift, enlargement, attenuation) of the SPR. Such properties have contributed to the emergence of plasmonics. Considering the catalytic properties of nanoalloys and the influence of the reaction medium on the NP structure, a possible application of plasmonics is to use SPR measurements for monitoring chemical reactions (in situ and operando), occurring at the NP surface. In this communication, we report on the development of a new setup, based on the principle of beam modulation spectrophotometry (fig. 1) for measuring the optical absorption of metallic clusters under a controlled environment. This setup will enable us to observe any change of the SPR under temperature or atmosphere variations, with the goal of exploring chemical reaction kinetics, catalyzed by metallic nanoalloys. This will be illustrated in the case of CuAg nanoalloys of different sizes and stoichiometries, produced with a laser vaporization source and studied under vacuum.

Published
2014

56. Systematic measurements of the Bohr-Weisskopf effect at ISOLDE

Author

Gustafsson, M, Nojiri, Y, Matsuki, S, Ragnarsson, I, Neugart, R, Redi, O, Stroke, H H, Duong, H T, Marescaux, D, Pinard, J, Juncar, P, Ekstrom, C, Pellarin, M, Vialle, J-L, and Inamura, T

Subjects
Physics::Accelerator Physics, Nuclear Physics - Experiment, Physics::Atomic Physics
Abstract

The " Bohr-Weisskopf " effect, or " hyperfine structure (hfs) anomaly ", which results from the effect of the distribution of nuclear magnetization on the electro-nuclear interaction, will be measured systematically at the PS Booster ISOLDE, first for a long chain of radioactive cesium isotopes, analogously to previous isotope shift and hfs studies. In addition to the direct measurement of magnetic moment values, the results are expected to provide independent data for testing nuclear wavefunctions, these will be of importance for interpreting systematic parity non-conservation experiments, complementary to the single isotope study which requires a high precision knowledge of the electron wavefunction. Substantial progress in these calculations has been achieved recently. Precision measurements of the hfs splittings and nuclear magnetic moments are required, with sensitivity adequate for the radioactive isotopes produced. A triple resonance atomic beam magnetic resonance apparatus with optical pumping state selection has been constructed. Detection of the beam atomic state is by laser-induced fluorescence or by magnetic focusing and mass spectrometry. The performance of the apparatus has been tested with stable K and Rb beams. Results obtained for g-values and hfs anomalies are in excellent agreement with published data, and show the technique to be well suited for the on-line experiments at ISOLDE. Nevertheless, the implantation of such an experiment at ISOLDE requires the neutralization of the ISOLDE ion beam and the production of a thermal atomic beam. This corresponds to a very delicate interfacing part of the instrument which posed some problems, but which are now near to being solved. For that, in order to study the properties of various types of neutralizer and improve on the observed efficiency, we have constructed an auxiliary ion source, this allowed us to demonstrate that a neutralization efficiency of 40~\% can be achieved using a simple current heated tantalum tube in which a smaller Yttrium tube was inserted. A more sophisticated neutralizer, an " orthotropic " atomic beam source, has been constructed. It is essentially a small heated chamber, with entrance and exit holes, that contains the small neutralizing element at a negative potential. The neutral atoms, after multiple bounces from the chamber walls, emerge through the exit hole. The ion component returns from the chamber walls to the neutralizer under the action of the field for recycling. This source is expected to increase the efficiency in the thermal neutral beam production; this will be tested very soon using a beam of stable Cs from ISOLDE. Furthermore, to improve the acceptance angle of the apparatus, and thus, the sensitivity; we added, just behind the neutralizer, a new six-pole permanent magnet. Tests on the whole apparatus are in progress.\\ \\

Published
2002

57. Bridging C60 by silicon : towards non-van der Waals C60-based materials

Author

Tournus, F., Masenelli, B., Mélinon, P., Blase, X., Perez, A., Pellarin, M., Broyer, M., Flanck, A.M., Lagarde, P., Laboratoire de Spectrométrie Ionique et Moléculaire ( LASIM ), École normale supérieure - Lyon ( ENS Lyon ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Spectrométrie Ionique et Moléculaire (LASIM), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Abstract

International audience; We report the three-dimensional packing of C60 clusters stabilized by the addition of Si. X-ray absorption spectroscopy reveals that Si atoms are in an unusual environment: between two C60, with ten or more carbon neighbors. According to ab initio calculations, the cohesive energy is about 2 eV per Si atom, much higher than the Van der Waals binding energy between two C60. Experiment and calculations both indicate a charge transfer from Si to C60. Eventually, the film may have a local decahedral symmetry.

Published
2002
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60. Properties of silicon-carbon-cluster-assembled films

Author

Kéghélian, P., Mélinon, P., Perez, A., Lermé, J., Ray, C., Pellarin, M., Broyer, M., Rousset, J. L., Cadete Santos Aires, F. J., Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
2000

61. Preparation of bimetallic PtnPdm supported clusters with well-defined stoichiometry

Author

Rousset, J.L., Cadrot, A.M., Cadete Santos Aires, F.J., Renouprez, A.J., Melinon, P., Perez, A., Pellarin, M., Vialle, J.L., Broyer, M., IRCELYON, ProductionsScientifiques, Institut de recherches sur la catalyse (IRC), and Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
1996

63. Functional nanostructures from clusters

Author

Perez, A., primary, Melinon, P., additional, Dupuis, V., additional, Bardotti, L., additional, Masenelli, B., additional, Tournus, F., additional, Prevel, B., additional, Combes, J. Tuaillon, additional, Bernstein, E., additional, Tamion, A., additional, Blanc, N., additional, Tainoff, D., additional, Boisron, O., additional, Guiraud, G., additional, Broyer, M., additional, Pellarin, M., additional, Fatti, N. Del, additional, Vallee, F., additional, Cottancin, E., additional, Lerme, J., additional, Vialle, J L., additional, Bonnet, C., additional, Maioli, P., additional, Crut, A., additional, Clavier, C., additional, Rousset, J.L., additional, and Morfin, F., additional

Published
2010
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64. Quantitative Determination of the Size Dependence of Surface Plasmon Resonance Damping in Single Ag@SiO2 Nanoparticles

Author

Baida, H., primary, Billaud, P., additional, Marhaba, S., additional, Christofilos, D., additional, Cottancin, E., additional, Crut, A., additional, Lermé, J., additional, Maioli, P., additional, Pellarin, M., additional, Broyer, M., additional, Del Fatti, N., additional, Vallée, F., additional, Sánchez-Iglesias, A., additional, Pastoriza-Santos, I., additional, and Liz-Marzán, L. M., additional

Published
2009
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70. Stark effect in argon Rydberg states

Author

Pellarin M, Brevet Pf, and Vialle Jl

Subjects
Physics, Argon, chemistry.chemical_element, Atomic and Molecular Physics, and Optics, Molecular electronic transition, symbols.namesake, Stark effect, chemistry, Electric field, Rydberg formula, symbols, Rydberg state, Atomic physics, Laser beams
Abstract

Par spectrometrie laser solineaire, etude de la structure Stark des etats de Rydberg au voisinage du multiplet hydrogenoide n=18, pour des champs electriques de 0 a 120Vcm −1 . Observation de plusieurs composantes de structure fine pour chaque niveau Stark. Comparaison quantitative aux calculs effectues en couplage jK

Published
1990

75. Electron-Phonon Scattering in Metal Clusters

Author

Arbouet, A., primary, Voisin, C., additional, Christofilos, D., additional, Langot, P., additional, Fatti, N. Del, additional, Vallée, F., additional, Lermé, J., additional, Celep, G., additional, Cottancin, E., additional, Gaudry, M., additional, Pellarin, M., additional, Broyer, M., additional, Maillard, M., additional, Pileni, M. P., additional, and Treguer, M., additional

Published
2003
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80. SiC bonding in ( C60)n Sim clusters

Author

Mélinon, P., primary, Tournus, F., additional, Masenelli, B., additional, Perez, A., additional, Pellarin, M., additional, Lermé, J., additional, Broyer, M., additional, and Champagnon, B., additional

Published
2001
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94. Silicon-carbon mixed clusters

Author

Pellarin, M., primary, Ray, C., additional, Mélinon, P., additional, Lermé, J., additional, Vialle, J.L., additional, Kéghélian, P., additional, Perez, A., additional, and Broyer, M., additional

Published
1997
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