Collisional quenching of He/sub 2/ molecules in the a /sup 3/. sigma. /sup +//sub u/ level by impurity gases

Journal Article · Sat Aug 15 04:00:00 EDT 1981 · J. Chem. Phys.; (United States)

OSTI ID:6315252

Parker, J W; Anderson, L W; Fitzsimmons, W A; Lin, C C

Measurements in a fast pulsed discharge of the room temperature rate constant for the quenching of He/sub 2/ molecules in the metastable a /sup 3/..sigma../sup +//sub u/ level by Ar, N/sub 2/, O/sub 2/, H/sub 2/, and CO/sub 2/ are reported at He pressures of 200 and 300 Torr and for various pressures of the impurity gas. The concentration of He/sub 2/ molecules in the a /sup 3/..sigma../sup +//sub u/ level is monitored by using a pulsed dye laser to excite the Q5 line of the e /sup 3/..pi../sub g/reverse arrowa /sup 3/..sigma../sup +//sub u/ transition and by observing the subsequent d /sup 3/..sigma../sup +//sub u/..-->..b /sup 3/..pi../sub g/ fluorescence. The results for N/sub 2/, Ar, and CO/sub 2/ are combined with previous data of others to obtain both bimolecular and termolecular rate constants for the quenching of the a /sup 3/..sigma../sup +//sub u/ level.

• Research Organization: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 6315252
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 75:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
DE-EXCITATION
DIMERS
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
GASES
HELIUM
HYDROGEN
KINETICS
METASTABLE STATES
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
MOLECULES
NITROGEN
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
RARE GASES
SPECTRA