Laser studies of the collisional quenching of electronically excited Mg(3s3p /sup 1/P/sub 1/) atoms

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

OSTI ID:6194226

Breckenridge, W H; Umemoto, H

Quenching of the Mg(3s3p /sup 1/P/sub 1/) state by several simple gases has been studied using pulsed laser techniques. Absolute quenching cross sections were determined by pulsed laser excitation of Mg(/sup 1/P/sub 1/) and time-resolved measurements of 2852 A fluorescence. Qualitative identification of major exit channels was accomplished using laser-induced fluorescence at short time delays. Except for the inert gases and the perfluoroalkanes, the cross sections were approximately gas kinetic and correlated well with the C/sub 6/ long-range forces coefficient to the power 0.48 +- 0.05. In contrast to the analogous Cd(5s5p /sup 1/P/sub 1/) level, production of Mg(/sup 3/P/sub J/) by collision-induced intersystem crossing was negligible for all quenching molecules studied. Production of MgH was observed for H/sub 2/, CH/sub 4/, C/sub 3/H/sub 6/, C/sub 3/H/sub 8/, and n-C/sub 4/H/sub 10/, but not for C/sub 2/H/sub 2/ or C/sub 2/H/sub 4/.

• Research Organization: Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
• OSTI ID: 6194226
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 75:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ALKANES
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
DE-EXCITATION
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUORESCENCE
HYDROCARBONS
HYDROGEN
LUMINESCENCE
MAGNESIUM
METALS
METHANE
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS