Electron-impact excitation of the n sup 1 P levels of helium: Theory and experiment

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

DOI:https://doi.org/10.1103/PhysRevA.45.1602· OSTI ID:7047620

Cartwright, D C; Csanak, G ^[1]; Trajmar, S; Register, D F ^[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, Pasedena, California 91109 (United States)

New experimental electron-energy-loss data have been used to extract differential and integral cross sections for excitation of the 2 {sup 1}{ital P} level, and for the overlapping (3 {sup 1}{ital P},3 {sup 1}{ital D},3 {sup 3}{ital D}) levels of helium, at 30-, 50-, and 100-eV incident electron energies. First-order many-body theory (FOMBT) has been used to calculate the differential and integral cross sections for excitation of the {ital n} {sup 1}{ital P} ({ital n}=2,...,6) levels of helium by electron impact, for incident electron energies from threshold to 500 eV. Detailed comparisons between these two new sets of data are made as well as comparisons with appropriate published experimental and theoretical results. A simple scaling relationship is derived from the FOMBT results for {ital n}=2,...,6 that provides differential and integral cross sections for all symmetry final levels of helium with {ital n}{ge}6.

• OSTI ID: 7047620
• 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
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
ENERGY-LOSS SPECTROSCOPY
EV RANGE
EV RANGE 10-100
EXCITATION
FLUIDS
GASES
HELIUM
INTEGRAL CROSS SECTIONS
NONMETALS
P STATES
RARE GASES
SPECTROSCOPY
THRESHOLD ENERGY