Mechanism of thermal electron attachment to O/sub 2/ as studied by observing isotope effects of attachment rates for /sup 18/O/sub 2/ systems

Journal Article · Tue Feb 01 04:00:00 EST 1983 · J. Chem. Phys.; (United States)

OSTI ID:6523847

Shimamori, H; Hotta, H

Thermal electron attachment in pure /sup 18/O/sub 2/ and its mixtures with H/sub 2/, D/sub 2/, N/sub 2/, and CO/sub 2/ has been studied at room temperature. The three-body attachment rate constants for pure /sup 18/O/sub 2/, and its H/sub 2/, D/sub 2/, and CO/sub 2/ mixtures are twice or more greater than those for the corresponding /sup 16/O/sub 2/ systems, but slightly smaller than those expected from the Bloch--Bradbury mechanism. Analyses of the results suggest that the attachment in those systems mostly follow the Bloch--Bradbury mechanism but involve a partial contribution of the attachment to van der Waals molecules containing oxygen. The result for the /sup 18/O/sub 2/--N/sub 2/ mixture, in which the three-body rate constant increases only by a factor of 1.3 compared to that for the /sup 16/O/sub 2/--N/sub 2/ mixture, strongly suggests a significant role of the attachment to van der Waals molecule (O/sub 2/xN/sub 2/) in this case. The difference in the rate constant between the H/sub 2/ and D/sub 2/ mixtures may primarily be interpreted in terms of the difference in the collisional-stabilization probability between O/sup -//sub 2/*-H/sub 2/ and O/sup -//sub 2/*-D/sub 2/ collisions.

• Research Organization: Fukui Institute of Technology, Fukui 910, Japan
• OSTI ID: 6523847
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COLLISIONS
DEUTERIUM
DISPERSIONS
ELECTRON ATTACHMENT
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
EVEN-EVEN NUCLEI
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
KINETICS
LIGHT NUCLEI
MIXTURES
MOLECULE COLLISIONS
NITROGEN
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
REACTION KINETICS
STABLE ISOTOPES