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Absolute differential and integral electron excitation cross sections for atomic oxygen. 5. Revised values for the /sup 3/P. -->. /sup 3/S/sup 0/ (1304 A) and /sup 3/P. -->. /sup 3/D/sup 0/ (989 A) transitions below 30 eV

Journal Article · · J. Geophys. Res.; (United States)
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A new apparatus designed specifically for the study of electron scattering from unstable species at very low incident energies has been constructed and put into operation. Remeasurement of the O I /sup 3/P..-->../sup 3/S/sup 0/ (1304 A) differential and integral cross sections (DCS and ICS) at energies below 30 eV has provided new values for the DCS and ICS for this cross section as well as for the /sup 3/P ..-->.. /sup 3/D/sup 0/ (989 A) transition. These new values replace the cross sections reported by Vaughan and Doering (1987) which were measured in the original apparatus designed for high incident energy work. The two sets of measurements agree at incident energies 30 eV and above. However, the new values for the /sup 3/P..-->../sup 3/S/sup 0/ transition at 20 and 16.5 eV are larger than the previous measurements by a factor of 2 to 3. Extension of the work on this transition down to 13.87 eV shows that the cross section remains large to within a few eV of threshold, in agreement with the theoretical predictions of Rountree and Henry (1972) and Smith (1976). Similar behavior is observed for the /sup 3/P..-->../sup 3/D/sup 0/ (989 A) transition down to 20 eV. copyright American Geophysical Union 1988
Research Organization:
Department of Chemistry, Johns Hopkins University, Baltimore, Maryland
OSTI ID:
6952545
Journal Information:
J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 93:A6; ISSN JGREA
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EXCITATION
INTEGRAL CROSS SECTIONS
NONMETALS
OXYGEN