Time-resolved flourescence measurements of KrF emission produced by vacuum ultraviolet photolysis of KrF/sub 2/ mixtures
Vacuum ultraviolet (VUV) light radiation was used to produce electronically excited KrF excimers (in D-, B- and C-states) by the photolysis of KrF/sub 2/ and F/sub 2//Kr mixtures at various excitation wavelengths. The excited KrF photoproduct quantum yield was measured over the excitation wavelength range of 120 to 200 nm, and a quantum efficiency of 0.45 was estimated at the peak absorption wavelength of 159 nm for KrF/sub 2/. The collision-free fluorescence lifetime of the B-X transition near 248 nm was determined to be 9.9 /plus minus/ 0.6 ns when the KrF/sub 2/ was excited with the 159 nm light. Near gas kinetic rate constants were measured for the quenching of KrF B-X emission by KrF/sub 2/ and CO/sub 2/. Using the threshold energy needed for observing excited KrF photofragments, an upper bound for the bond dissociation energy of KrF/sub 2/ was determined to be 1.03 /plus minus/ 0.1 eV. 14 refs., 8 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5844798
- Report Number(s):
- LA-UR-89-2337; CONF-8907130-1; ON: DE89015267
- Resource Relation:
- Conference: 9. vacuum ultraviolet radiation conference, Honolulu, HI, USA, 17-21 Jul 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
42 ENGINEERING
KRYPTON FLUORIDES
FLUORESCENCE
PHOTOLYSIS
ABSORPTION
DISSOCIATION
EXCITED STATES
ULTRAVIOLET RADIATION
WAVELENGTHS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
KRYPTON COMPOUNDS
LUMINESCENCE
PHOTOCHEMICAL REACTIONS
RADIATIONS
RARE GAS COMPOUNDS
400500* - Photochemistry
420300 - Engineering- Lasers- (-1989)