In:
Laser Chemistry, Hindawi Limited, Vol. 14, No. 4 ( 1994-01-01), p. 191-200
Abstract:
The time variation of the 2ν 5 fluorescence intensity was measured in CDCl 3 excited in the ν 4 C–D
bending mode by a TEA CO 2 laser operating on the 10P(48) line. A fast rise of the fluorescence, with
a time constant ≤ 1 μs Torr, was first observed, showing that a fast equilibration of population occurs between the ν 4 and ν 5 modes through a ν 4 ↔ ν 5 Coriolis-assisted intermode transfer and a ν 5 ↔ 2ν 5 near-resonant ladder-climbing process. Then a first fast fluorescence decay was observed and attributed
to a (ν 4 , ν 5 ) → ν 2 intermode transfer with a rate constant of (7.10 ± 1.13)ms -1 Torr -1 . At last, a much
slower decay, with a rate constant of 0.111 ± 0.015 ms -1 Torr -1 , results from the less efficient intermode
transfer and V–T,R deexcitation processes involving the ν 3 and ν 6 states, and which compete to relax
the gas to a thermodynamic equilibrium.
Type of Medium:
Online Resource
ISSN:
0278-6273
,
1476-3516
Language:
English
Publisher:
Hindawi Limited
Publication Date:
1994
detail.hit.zdb_id:
2035640-7