Ultraviolet absorption cross sections of infrared laser excited UF/sub 6/
Ultraviolet absorption cross sections of ..nu../sub 3/ vibration-excited UF/sub 6/ molecules were measured in the wavelength region between 230 and 280 nm. The state-selective excitation was accomplished by 16 ..mu..m laser pumping of the ground vibrational state of flow-cooled UF/sub 6/. Maximum changes in the absorption cross sections were observed toward longer wavelengths in the wings of the two charge transfer bands located at 220 and 260 nm. The results are discussed in terms of a transition from the ..nu../sub 3/ vibrationally excited state to an upper dissociative potential surface. The change in the UV absorption cross section was also monitored as a function of the IR laser frequency and the sample gas temperature. The IR excitation spectrum follows qualitatively the low resolution contour of the ..nu../sub 3/ Q branch. The magnitude in the absorption change is dependent on the fraction of molecules being accessed by the IR laser. The characteristic relaxation time for the ..nu../sub 3/ excitation was estimated to be about 0.25 ..mu..s Torr at 100 K.
- Research Organization:
- University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
- OSTI ID:
- 5174100
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 83:9; 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
ABSORPTION SPECTRA
ACTINIDE COMPOUNDS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LASER RADIATION
OPTICAL PUMPING
PUMPING
RADIATIONS
SPECTRA
ULTRAVIOLET SPECTRA
URANIUM COMPOUNDS
URANIUM FLUORIDES
URANIUM HEXAFLUORIDE
VIBRATIONAL STATES