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Angelie, Christian
Universite Pierre et Marie CURIE - Paris 6 (France); Commissariat a l'energie atomique et aux energies alternatives - CEA, CEN Saclay, Departement d'Etude des Lasers et de Physico-Chimie, IRDI/DESICP-DLPC-SPP/SPER, DSM/DPhG-SPER (France)1990
Universite Pierre et Marie CURIE - Paris 6 (France); Commissariat a l'energie atomique et aux energies alternatives - CEA, CEN Saclay, Departement d'Etude des Lasers et de Physico-Chimie, IRDI/DESICP-DLPC-SPP/SPER, DSM/DPhG-SPER (France)1990
AbstractAbstract
[en] This research thesis proposes an overview of knowledge on vibrationally highly excited states of molecules. The author shows that the statistic quasi-continuum formed by these states is preceded by a quasi continuum of weak transitions with a lower energy, and that these transitions remain structured and very narrow up to the dissociation energy and beyond. Collisions between molecules excited in their quasi continuum are then studied. The author particularly analyses a new phenomenon of isotopic selectivity which is important for the dissociation of a molecule colliding another molecule. It appears that this selectivity regarding selectivity is due to a selectivity of transferred energy which paradoxically increases with the molecule vibrational content because of a resonance phenomenon of energies transferred by dipole-dipole interaction
[fr]
L'etat des connaissances sur les etats vibrationnellement tres excites des molecules est decrit. On montre que le quasi continuum statistique forme par ces etats est precede d'un quasi continuum de transitions faibles a energie plus basse, et que les transitions entre ces etats restent structurees et tres etroites jusqu'a l'energie de dissociation et au-dela. Us collisions entre molecules excitees dans leur quasi continuum sont ensuite etudiees. Un phenomene nouveau de selectivite isotopique importante sur la dissociation d'une molecule entrant en collision avec une autre molecule est en particulier analyse. Il apparait que cette selectivite sur la dissociation provient d'une selectivite de l'energie transferee qui croit paradoxalement avec le contenu vibrationnel de la molecule en raison d'un phenomene de resonance des energies transferees par interaction dipole-dipole, resonance refletant les structures etroites du quasi continuum. (auteur)Original Title
Quasi continuum vibrationnel des molecules et proprietes de selectivites isotopiques induites par collisions
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15 Mar 1990; 511 p; 641 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; These Docteur Es Sciences
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