Absolute differential cross sections for the excitation of molecular oxygen by electron impact: Decomposition of the Schumann-Runge continuum

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.4794· OSTI ID:6847575

Shyn, T W; Sweeney, C J; Grafe, A; Sharp, W E ^[1]

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1. Space Physics Research Laboratory, University of Michigan, Ann Arbor, Michigan 48109-2143 (United States)

Using a crossed-beam method, we have measured electron-energy-loss spectra for the excitation of the Schumann-Runge continuum of molecular oxygen. The scattering angle and electron-impact energy ranges covered were 12[degree]--156[degree] and 15--50 eV, respectively. By means of computerized least-squares analysis, we decomposed the spectra into contributions from three superposed Gaussian line shapes. The two lowest in energy are identified as representing excitation of the 1[sup 3][Pi][sub [ital g]]([ital v]) and [ital B][sup 3][Sigma][sub [ital u]][sup [minus]]([ital v]) states. The other line shape cannot be definitively identified, but we discuss several possibilities for its meaning. Absolute differential and integrated cross sections for all three states are obtained, along with linear electronic potential-energy curves for the Franck-Condon region.

• OSTI ID: 6847575
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:6; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CHEMICAL REACTIONS
COLLISIONS
CROSS SECTIONS
DECOMPOSITION
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
ENERGY-LOSS SPECTROSCOPY
EXCITATION
MOLECULE COLLISIONS
NONMETALS
OXYGEN
SCHUMANN-RUNGE BANDS
SPECTROSCOPY