Dissociation and vibrational relaxation of XeF by various collision partners

Technical Report · Sat Jul 15 04:00:00 EDT 1989

OSTI ID:5477290

Bott, J F; Heidner, R F; Holloway, J S; Koffend, J B; Kwok, M A

The removal rates of the lower levels of XeF strongly affect the overall efficiency of the XeF excimer laser operating on the B yields X transitions. The authors have deduced the removal rates of XeF(X,v = 3) in krypton, xenon, nitrogen, and carbon dioxide and the removal rates of XeF(X,v = 0) in sulfur hexafluoride by monitoring the populations of vibrational levels formed by the photolysis XeF{sub 2}. The time history of the selected vibrational population is monitored with a continuous-wave (cw) tunable dye laser tuned to an absorption feature of the selected vibrational/rotational level. The studies show a rapid vibrational relaxation followed by a common decay rate of the coupled vibrational levels. The rare gases were found to remove XeF (X) with rate coefficients that differed from one another by less than a factor of 1.6. Larger removal-rate coefficients were measured for molecular-collision partners, with XeF{sub 2} having the largest rate coefficient. Rate coefficients were also determined for the concerted vibrational relaxation of v = 3 although the values do not represent state-to-state rate coefficients. Fast vibrational relaxation is required to empty the lower levels of the laser transitions so the vibrational bottlenecking does not terminate laser action prematurely.

• Research Organization: Aerospace Corp., El Segundo, CA (USA). Laboratory Operations
• OSTI ID: 5477290
• Report Number(s): AD-A-210769/6/XAB; TR--0088(3930-04)-2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DE-EXCITATION
DECAY
DECOMPOSITION
DISSOCIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCIMER LASERS
EXCITED STATES
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GAS LASERS
GASES
HALIDES
HALOGEN COMPOUNDS
KINETICS
KRYPTON
LASERS
MOLECULE COLLISIONS
MONITORING
MOTION
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RARE GAS COMPOUNDS
RARE GASES
REACTION KINETICS
RELAXATION
REMOVAL
ROTATION
SULFUR COMPOUNDS
VIBRATIONAL STATES
XENON COMPOUNDS
XENON FLUORIDES