Time-resolved flourescence measurements of KrF emission produced by vacuum ultraviolet photolysis of KrF/sub 2/ mixtures

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5844798

Tiee, J J; Quick, C R; Hsu, A H; Hof, D E

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 Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5844798
• Report Number(s): LA-UR-89-2337; CONF-8907130-1; ON: DE89015267
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
ABSORPTION
CHEMICAL REACTIONS
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
KRYPTON COMPOUNDS
KRYPTON FLUORIDES
LUMINESCENCE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
RARE GAS COMPOUNDS
ULTRAVIOLET RADIATION
WAVELENGTHS