Jean-Claude Cornut
University of Bordeaux
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Featured researches published by Jean-Claude Cornut.
Journal of Chemical Physics | 1972
M. Couzi; Jean-Claude Cornut; Pham V. Huong
The first direct observation of fluoronium ions, FH2+, FD2+, and FHD+, is reported. The method of production of the fluoronium salts is described, and their infrared spectra are analyzed. The structure of the fluoronium ions is shown to be angular. The force constants have been evaluated. In the presence of liquid hydrogen fluoride, the fluoronium ions are strongly solvated by hydrogen bonds in the form (HF)nH+.
Applied Spectroscopy | 1978
R. Cavagnat; Jean-Claude Cornut; M. Couzi; G. Daleau; Pham V. Huong
A device to improve the thermal exchange between the cold tail, in a Raman cryostat working at liquid helium temperatures, and the crystalline sample is described and a side-reference method for the temperature measurement is used. The method is then applied to the study of the phase transition in succinonitrile.
Journal of Chemical Physics | 1982
Pham V. Huong; Jean-Claude Cornut; Bernard Desbat
A special infrared spectral profile with an intense band and two satellites on each side is observed for hydrogen fluoride hydrogen bonded to deuterium fluoride molecules in the solid state. The sidebands are interpreted as the result of a combination of the FH stretching vibration with the stretching and bending modes of the hydrogen bond⋅⋅⋅F–H⋅⋅⋅F. This interpretation is confirmed by the temperature dependence of the intensity of the sidebands. The experimental result also reveals a strong mechanical anharmonicity in the coupling between the high frequency vibration and the low frequency modes and a strong electrical anharmonicity of the hydrogen‐bond vibrations.
Journal of Chemical Physics | 1976
Pham V. Huong; Jean-Claude Cornut
The infrared spectra of γ‐aminobutyric acid (GABA) in the solid state and inert gas matrices at several temperatures and concentrations have been analyzed. Evidence of a neutral molecular form of GABA is shown for the first time; this compound was known until now only in its zwitterionic or cationic forms. The intermolecular mechanism is also established for the formation of the GABA zwitterion. This final step is shown to be preceeded by hydrogen‐bonded intermediates.
Applied Spectroscopy | 1986
J. J. Martin; R. Cavagnat; Jean-Claude Cornut; M. Couzi; G. Daleau; J. Devaure; M. Maissara; R. Mokhlisse
A variable-temperature hydrostatic high-pressure cell for Raman scattering experiments is presented; it can be commonly used for pressures up to about 6 kbars, in the temperature range between 340 and 80 K. Examples of applications are given, concerning conformational equilibriums in liquid tridecane on the one hand, and structural phase transitions in crystalline (CH3)4NMnCl3(TMMC) and (CH3)4NCdCl3 (TMCC), on the other hand.
Applied Spectroscopy | 1988
Jean-Claude Cornut; Pham V. Huong; A. Graja; G. Daleau
A double jacket cryostat based on thermal convection between a gaseous cold stream filled in a freezing chamber and the sample cell is described. This device is designed for absorption spectroscopy in the infrared and in the UV-visible regions for gases, liquids, liquefied gases, and solids, as well as for the transitions between these phases or between phases in the solid state, over the range 85 to 340 K, at variable thicknesses and under a pressure of up to 10 bars.
Journal of Chemical Physics | 1971
Yves Grenie; Jean-Claude Cornut; Jean-Claude Lassegues
Journal de Chimie Physique | 1978
Dominique Gavagnat; Jean-Claude Cornut; R. Cavagnat; Jean Lascombe
Journal de Chimie Physique | 1979
Dominique Cavagnat; Jean-Claude Cornut; Jean Lascombe
Archive | 1991
Jean-Claude Cornut; Doris Schoolmann; Jean-Claude Lassegues; Francis Defendini; Christian Padoy