Collisional deactivation of selectively excited N+2

Autor:	Terry A. Miller, V. E. Bondybey, D. H. Katayama
Rok vydání:	1980
Předmět:	education.field_of_study Dye laser Chemistry Population General Physics and Astronomy Overtone band Homonuclear molecule Resonance fluorescence Excited state Vibrational energy relaxation Physical and Theoretical Chemistry Atomic physics Ground state education
Zdroj:	The Journal of Chemical Physics. 72:5469-5475
ISSN:	1089-7690 0021-9606
Popis:	Individual vibrational levels of the A 2Πu state of the N+2 molecular ion are excited by a tunable dye laser. Detection of an optical–optical double resonance fluorescence signal produced by a second laser demonstrates that the ions originally pumped into the A 2Πu state are rapidly deactivated by collisions with He into high vibrational levels of the ground X 2Σ+g state. Time and wavelength resolved studies show clearly that the population of a given high vibrational level of the X 2Σ+g state returns into lower A 2Πu state levels giving rise, effectively, to vibrational relaxation within the A state. Rate constants and cross sections are derived for these collisional, internal‐conversion processes. In homonuclear N+2, where symmetry considerations prohibit X and A state perturbations, these processes proceed as rapidly as in heteronuclear species where perturbations are known to be present in the free molecule.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::137348071c82a132055ac4df756ee595 https://doi.org/10.1063/1.439016 Zobrazit plný text záznamu