Photoassociative laser-induced fluorescence of XeCl* and kinetics of XeCl(B) and XeCl(C) in Xe
Laser induced fluorescence studies have been done with XeCl molecules, which demonstrate photoassociation (free--bound absorption) as well as conventional bound--bound absorption from the XeCl(X) van der Waals molecules. The XeCl(X) and Xe+Cl pairs were generated by a pulsed dc discharge through 1--6 Torr Xe/Cl/sub 2/ mixtures. Experiments also were done with Xe/HCl mixtures. The time and wavelength resolved XeCl(B--X) and XeCl(C--A) excitation and fluorescence spectra are reported. Model calculations were done to demonstrate that the laser excitation spectra for XeCl(B,v = 0-3) show laser-assisted photoassociation. The time resolved decay of the XeCl(B,v' = 0) and XeCl(C,v' = 0,1) states was used to measure the radiative lifetimes 11.1 +- 0.2 and 131 +- 10 ns, respectively, and the XeCl(B) and XeCl(C) coupling and quenching rate constants. The transfer and quenching rate constants for XeCl(B) by Xe are assigned as (11 +- 1) x 10/sup -11/ and (2.3 +- 0.3) x 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/, respectively; although, the sum is known with greater certainty than the individual values. The quenching rate constants of XeCl(B,v' = 0) by Cl/sub 2/ and HCl are (4.3 +- 0.2) x 10/sup -10/ and (6.3 +- 0.5) x 10/sup -10/ cm/sup 3/ molecule/sup -1/ s/sup -1/. Evidence is presented to show that the B--C coupling rate constants are comparable to the XeCl(B,C) vibrational relaxation rate constants for XeCl(B,v' = 2) in collisions with Xe.
- Research Organization:
- National Institute for Environmental Studies, P. O. Tsukuba-gakuen, Ibaraki 305, Japan
- OSTI ID:
- 6741773
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:12; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE
CHLORINE COMPOUNDS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
FLUORESCENCE
GAS LASERS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
LASERS
LUMINESCENCE
MOLECULE COLLISIONS
NONMETALS
PHOTOCHEMICAL REACTIONS
RARE GAS COMPOUNDS
RARE GASES
RELAXATION
VIBRATIONAL STATES
XENON
XENON CHLORIDES
XENON COMPOUNDS