184 research outputs found
PERTURBATION ANALYSIS IN THE ASUNDI SYSTEM OF ) AND IN THE BALLIK-RAMASY SYSTEM OF
No full textAuthor Institution: Address of Amiot and Islami: Laboratoire de Physique Mol\'eculaire et Optique Atmosph\'erique, CNRS, B\^{a}t. 221, Campus d'Orsay, 91405 Orsay Cedex, FranceThe molecules were produced by a microwave discharge through or mixtures. The spectra were recorded in Laboratoire Aim\'e Cotton (Orsay) by high resolution Fourier transferm spectroscopy. Very strong perturbations (greater than ) were deteceted during the rotational analysis of the Asundi system. The vibrational levels , of the state interact respectively with the , levels. The theoretical model we have used inculde second order spin-orbit and spin-rotation interactions parameters in order to reproduce the observed perturbed wavenumbers to the F.T.S. accuracy (about ). A similar work was performed for the Ballik-Ramsay system interactions. For the three molecules, about 11600 wavenumbers were reduce with a R.M.S. Accurate molecular constants and interaction parameters were . The variation of the electronic parameters with internulear distance will be discussed. C. Amiot and K. Islami, J. Mol. Spectrosc. (to appear) 2 K. Islami and C. Amiot, J Mol. Spectrose. (to appear)
Pronostic de la pseudo-obstruction intestinale chronique (étude d'une cohorte dans une unité d'assistance nutritive)
No full textPARIS7-Xavier Bichat (751182101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
HIGH RESOLUTION FOURIER SPECTROSCOPY OF THE LASER EXCITED FLUORESCENCE SPECTRUM: FIVE NEW ELECTRONIC STATES
No full text C. AMIOT, C. CREPIN, J. VERGES. Chem. Phys. Lett. 98, 608 (1983) C. AMIOT, C. CREPIN, J. VERGES. Chem. Phys. Lett. (accepted) C. AMIOT, C. CREPIN, J. VERGES. J. Mol. Spectrosc. (submitted)Author Institution: Laboratoire Aim\'{e}-Cotton - CNRS II; Laboratoire de Physique Mol\'{e}culaire et d'Optique Atmosph\'{e}rique, B\^{a}timent 221, Campus d'OrsayThe fluorescence of was observed inside a heat pipe oven which was operated at . The spectra were recorded at high resolution with a Fourier transform Interferometer. The fluorescence excited by the and lasers was observed mainly in the spectral regions and also near the laser lines. The molecular constants of the pumped state where deduced from an analysis of the rotational relaxations and also thanks to the great number of pumped rotational levels. Molecular constants for three gerade states: and were derived from the study of the fluorescence spectra [1]. When using the ring dye laser, very high vibrational levels of the (2) state were observed. Triplets in the region were assigned to the fluorescence from the state to the component of the lowest state
Derived invariants for surface cut algebras II: the punctured case
No full text32 pagesInternational audienceFor each algebra of global dimension 2 arising from the quiver with potential associated to a triangulation of an unpunctured surface, Amiot-Grimeland have defined an integer-valued function on the first singular homology group of the surface, and have proved that two such algebras of global dimension 2 are derived equivalent precisely when there exists an automorphism of the surface that makes their associated functions coincide. In the present paper we generalize the constructions and results of Amiot-Grimeland to the setting of arbitrarily punctured surfaces. As an application, we show that there always is a derived equivalence between any two algebras of global dimension 2 arising from the quivers with potential of (valency at least 2) triangulations of arbitrarily punctured polygons. While in the unpunctured case the quiver with potential of any triangulation admits cuts yielding algebras of global dimension at most 2, in the case of punctured surfaces the QPs of some triangulations do not admit cuts, and even when they do, the global dimension of the corresponding degree-0 algebra may exceed 2. In this paper we give a combinatorial characterization of each of these two situations
HIGH RESOLUTION SPECTRA OF NITROUS OXIDE AND OF THE ISOTOPIC SPECIES, IN THE REGION
No full textC. Amiot and G. Guelachvili, J. Mol Spectrosc. (to be published)Author Institution: Laboratoire de Physique, Mol\'{e}culaire et d'Optique Atmosph\'{e}rique B\^{a}timent 221.High resolution spectra of nitrous oxide and of the three isotopic species , have been recorded with the Fourier transform interferometer of Laboratoire Aim\’{e} Cotton, Absorption path lengths ranging from 10M to 50M were employed with gas pressures of 1T to 100T for the normal form and equal to 3T for the isotopes. The rotational analysis of the bands was performed with a line identification program written for IBM 370/168 computer. Forty-eight Levels of twenty-eight levels for each isotopic species were analyzed. Several Local Coriolis resonances have been found in the course of the analysis. These data are used in the determination of the potential function with the programs of A. Chedin and Z, Cilha for linear XYZ molecules
LOW LYING ELECTRONIC STATES OF THE BaI MOLECULE
No full textAuthor Institution: Universidade Federal Fluminense; Laboratoire Aim\'e Cotton, B\^at 505, Campus d'Orsay 91405, Orsay Cedex, France, Laborat\'orio de Espectroscopia e Laser, Universidade Federal FluminenseThe first five electronic states of the BaI molecule, as well as the G electronic state of the same molecule, were investigated using Thermal Emission (TE), Laser Induced Fluorescence (LIF) and Fourier Transform Spectroscopy (FTS) techniques. The LIF visible and infrared spectra were obtained by using the Ti:sapphire, dye and second harmonic of Ti:sapphire single-mode lasers and the and multi-mode lasers as excitation sources. Previously recorded data, taken from C. A. Leach, A. A. Tsekouras, and R. N. Zare (J. of Mol. Spectrosc., 153, 59-72 (1992)) were combined with the present work data. Accurate and improved molecular constants for the , , , , and states and sixteen term values of the state were derived from a simultaneous treatment of the whole data set (12,684 transitions) with a standard deviation of . (R. F. Gutterres, C. E. Fellows, J. Verg\`es, and C. Amiot (J. of Mol. Spectrosc., 206, 1-11 (2001))
Les orgues à bouche sheng du musée du Quai Branly: Pour une anthropologie des instruments comme trésors
No full textFirst identification and description of the mouth organs sent by Amiot to Bertin in 1776 and discovered by the author at the Musée du Quai Branly (Paris)Premières identification et description des instruments envoyés par Amiot à Bertin en 1776 et retrouvés par l'auteur au Musée du Quai Branl
Les orgues à bouche sheng du musée du Quai Branly: Pour une anthropologie des instruments comme trésors
No full textFirst identification and description of the mouth organs sent by Amiot to Bertin in 1776 and discovered by the author at the Musée du Quai Branly (Paris)Premières identification et description des instruments envoyés par Amiot à Bertin en 1776 et retrouvés par l'auteur au Musée du Quai Branl
DOPPLER-FREE STUDY OF THE TiO MOLECULE
No full text C. A***io***, E.M. Azaroual, P. Luc and R. Vetter, J. Chem. Phys., 102, 4375 (1995). C. Amiot, M. Cheikh, P. Luc and R. Vetter, J. Mol. Spectroscopy, 179, 159 (1996).Author Institution: Laboratoire Aim\'{e} Cotton (CNRS UPR3321), Campus d'OrsayWe have studied the yellow-orange absorption spectrum of the TiO molecule by use of a Doppler-free spectroscopy experiment in which a cw tunable laser beam crosses an effusive beam of titanium monoxide. Thousands of wavenumbers belonging to the and bands have been measured to an accuracy of and interpreted in terms of molecular constants. For the first , analysis of fine structure and A-doubling shows that the electronic structure of the state must be revisited. For the second , electronic interactions with distant vibrational levels of the state must be considered to assign high rotational levels. Analysis of the spectra due to the five isotopes of titanium is on the tracks
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