The time evolution of the velocity distribution of hydrogen atoms in a bath gas
Journal Article
·
· Journal of Chemical Physics; (USA)
- Department of Chemistry, Columbia University, New York, New York 10027 (US)
In this work we probe an ensemble of energetic hydrogen atoms dilutely dispersed in a bath gas which is at thermal equilibrium. A recently developed laser-induced fluorescence technique allows a quantitative measurement on a nanosecond time scale of the shape of a Doppler-broadened absorption line of hydrogen atoms. A nonequilibrium distribution of H atoms is generated by photodissociation, and the line shape is then measured at a flxed time delay as a function of buffer gas pressure. The buffer gases used are He, Ar, Kr, Xe, O{sub 2}, and N{sub 2}. A technique perfected by Shizgal is used to integrate the linearized Boltzmann equation for a hard-sphere potential. The experimental results for the decay of the kinetic energy are fit with cross sections of 10{plus minus}2, 9{plus minus}2, 12{plus minus}2, and 16(+8{minus}4) A{sup 2} for He, Ar, Kr, and Xe, respectively.
- OSTI ID:
- 5017565
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 91:12; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMS
BOLTZMANN EQUATION
COLLISIONS
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ELEMENTS
EQUATIONS
FLUIDS
FLUORESCENCE
GASES
HYDROGEN
LINE BROADENING
LINE WIDTHS
LUMINESCENCE
NONMETALS
PARTIAL DIFFERENTIAL EQUATIONS
SLOWING-DOWN
VELOCITY
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMS
BOLTZMANN EQUATION
COLLISIONS
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ELEMENTS
EQUATIONS
FLUIDS
FLUORESCENCE
GASES
HYDROGEN
LINE BROADENING
LINE WIDTHS
LUMINESCENCE
NONMETALS
PARTIAL DIFFERENTIAL EQUATIONS
SLOWING-DOWN
VELOCITY