Oscillator strengths and electron collisional excitation cross sections for atomic oxygen

Journal Article · Mon May 01 04:00:00 EDT 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.4531· OSTI ID:6320647

Tayal, S S; Henry, R J.W.

Absorption oscillator strengths for dipole-allowed transitions among the 2p/sup 4/ /sup 3/P, 3s /sup 5,3/S/sup 0/, 3p /sup 5,3/P, 4s /sup 5,3/S/sup 0/, 3d /sup 5,3/D/sup 0/, 4p /sup 5,3/P, and 3s' /sup 3/D/sup 0/ states of O I are calculated in length and velocity formulations using extensive configuration-interaction wave functions. We also include these 12 states in our close-coupling calculations of the inelastic cross sections for O I. Cross sections for excitation of the 3s /sup 5/S/sup 0/, 3p /sup 5/P, 4s /sup 3/S/sup 0/, 4p /sup 3/P, 3d /sup 3/D/sup 0/, and 3s' /sup 3/D/sup 0/ states by electron impact are presented in the energy region from 13.87 to 100 eV and these are compared, where available, with other calculations and experiments. The present results are in good agreement with the recent experiments at energies 13.87, 20, and 30 eV for the /sup 3/P--3p /sup 5/P transition and at energies 13.87 and 16.5 eV for the /sup 3/P--3s /sup 5/S/sup 0/ transition. However, the present cross sections for the /sup 3/P--3s /sup 5/S/sup 0/ transition at 20 and 30 eV are large by a factor of 2 compared to experiment. There are discrepancies between theory and experiment in magnitude for the dipole-allowed /sup 3/P--3d /sup 3/D/sup 0/ and /sup 3/P--3s' /sup 3/D/sup 0/ transitions.

• Research Organization: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001
• OSTI ID: 6320647
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:9; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
ATOM COLLISIONS
COLLISIONS
CONFIGURATION INTERACTION
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
NONMETALS
OSCILLATOR STRENGTHS
OXYGEN