Open AccessMECHANISM OF FORMATION OF C2* d3Пg STATE FROM CHCIF2 BY IRRADIATION WITH INTENSE IR LASER
Author(s) -
Zhengmin Wang,
Yang Li-Shu,
Zongcai Liu,
Wu Chuan-Xiu,
Ge Li-He
Publication year - 1987
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.36.391
Subject(s) - excited state , dissociation (chemistry) , atomic physics , molecule , irradiation , laser , radical , photochemistry , materials science , physics , chemistry , optics , nuclear physics , organic chemistry , quantum mechanics
Electronically excited radicals C2* were formed from CHC1F2 molecules by irradiation with a TEA CO2 laser. Six bands of Swan system have been observed. The mechanism of the formation of C2*d3Πg state in the infrared multiphoton dissociation of CHC1F2 is presented based on the potential energy curves of the C2 molecule. C2 is a somewhat unnsual molecule, the state b3∑g- crosses the first excited state a3Πu at an internuclear distance of about 1.80?, and lies below it for greater nuclear separations. At first, the state b3∑g- is formed in the elementary step C + CF2 + M→C2* + F2 + M of the reactionsof the photoproducts of CHC1F2 in preference to the low-lying X1∑g+ and a3Πu states, and then undergoes a radiationless transition into the d3Πg state through crossing with the d3Πg,ν′= 6 level.