Excitation of the OI (3s /sup 5/S/sup 0/--3p /sup 5/P; lambda7774 A) multiplet by electron impact on O/sub 2/

Journal Article · Thu Oct 15 04:00:00 EDT 1987 · J. Chem. Phys.; (United States)

OSTI ID:6363201

Erdman, P W; Zipf, E C

We have measured the absolute cross section value and emission linewidths of the OI (3s/sup 5/S/sup 0/--3p/sup 5/P; lambda7774 A) multiplet excited by electron impact on O/sub 2/. The 3p/sup 5/P cross section, which was measured from threshold to 400 eV, is large, with a value of 4.23 x 10/sup -18/ cm/sup 2/ +- 14% measured at 100 eV, hence this cascade feature constitutes a significant source of excitation for the OI (/sup 5/S/sup 0/) state. The multiplet's emission line widths are highly Doppler broadened in dissociative excitation, and display two distinct kinetic energy distributions. These distributions indicate that both purely repulsive and discrete, bound, excited molecular states which then predissociate are involved in the dissociation process leading to the excitation of OI lambda7774 A. The magnitude of the measured cross section, and the fragment kinetic energy distribution inferred from the observed Doppler broadening both indicate that previous time-of-flight studies of the metastable OI (/sup 5/S/sup 0/) state require some reinterpretation.

• Research Organization: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
• OSTI ID: 6363201
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 87:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATMOSPHERIC CHEMISTRY
CHEMISTRY
COLLISIONS
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
INFRARED RADIATION
MOLECULE COLLISIONS
NEAR INFRARED RADIATION
NONMETALS
OXYGEN
RADIATIONS
SPECTRA