Magnetic-sublevel cross sections for excitation of the n sup 1 P levels of helium by electron impact

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.1625· OSTI ID:7205846

Csanak, G; Cartwright, D C ^[1]; Trajmar, S ^[2]

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1. University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States)

First-order many-body theory has been used to calculate collision-frame magnetic-sublevel differential cross sections for electron-impact excitation of the {ital n} {sup 1}{ital P} ({ital n}=2,3,4,5,6) levels of helium for electrons with incident energy in the 25--500-eV range. By combining results from electron-impact differential-cross-section measurements and electron-photon coincidence measurements, experimental magnetic-sublevel cross sections have also been derived for the excitation of the 2 {sup 1}{ital P} and 3 {sup 1}{ital P} levels. The theory predicts a pronounced minimum for the {ital M}=0 magnetic-sublevel differential cross section for incident electron energies around 30 eV. Our theoretical results are compared to the experimental data and some other theoretical results.

• OSTI ID: 7205846
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BOSONS
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY DEPENDENCE
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
FLUIDS
GASES
HELIUM
LEPTONS
MANY-BODY PROBLEM
MASSLESS PARTICLES
NONMETALS
P STATES
PHOTONS
QUANTUM NUMBERS
RARE GASES