Cross sections for electron-impact excitation out of metastable helium levels
Journal Article
·
· Phys. Rev. Lett.; (United States)
Absolute apparent cross sections for electron-impact excitation out of the 2/sup 3/S metastable level of He to the 3/sup 3/S, 4/sup 3/S, 3/sup 3/P, 3/sup 3/D, 4/sup 3/D, 5/sup 3/D, and 6/sup 3/D levels have been measured by a novel method. A beam of metastable atoms from a hollow-cathode discharge is crossed by an electron beam of energy from 3 to 16 eV, and the emission from the excited states is detected. Absolute calibration is made by measuring the ratio of electron excitation cross section to the known optical-absorption cross section and using knowledge of the pertinent branching ratios. Direct electron-impact excitation cross sections for the 3/sup 3/P, 3/sup 3/S, and 3/sup 3/D levels are obtained.
- Research Organization:
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
- OSTI ID:
- 6271277
- Journal Information:
- Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 62:19; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMIC BEAMS
BEAMS
CATHODES
COLLISIONS
CROSS SECTIONS
D STATES
ELECTRIC DISCHARGES
ELECTRODES
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EXCITED STATES
FLUIDS
GASES
HELIUM
IONIZATION
LEPTON BEAMS
METASTABLE STATES
NONMETALS
P STATES
PARTICLE BEAMS
RARE GASES
S STATES
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMIC BEAMS
BEAMS
CATHODES
COLLISIONS
CROSS SECTIONS
D STATES
ELECTRIC DISCHARGES
ELECTRODES
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EXCITED STATES
FLUIDS
GASES
HELIUM
IONIZATION
LEPTON BEAMS
METASTABLE STATES
NONMETALS
P STATES
PARTICLE BEAMS
RARE GASES
S STATES