Electron-impact excitation of n = 2 levels of helium at intermediate energies. [30 to 100 eV, integral and differential cross sections, coupling]

Technical Report · Mon Jan 01 00:00:00 EST 1979

OSTI ID:6507547

Bhadra, K; Callaway, J; Henry, R J.W.

Five-state close coupling equations for electron--helium scattering are solved in the energy region from 30 to 100 eV. Integral and differential cross sections for excitation of the ground state to the n = 2 states (2/sup 3/S, 2/sup 1/S, 2/sup 3/P/sup 0/, and 2/sup 1/P/sup 0/) are presented. Calculated shapes of differential cross sections versus angle for various energies are in good agreement with measurements, but the magnitude of the cross sections are overestimated. Allowance for coupling between 2/sup 3/S and 2/sup 3/P/sup 0/ brings calculated differential cross sections into good quantitative agreement with experiment. 38 references.

• Research Organization: Louisiana State Univ., Baton Rouge (USA)
• DOE Contract Number: EY-76-S-05-4881
• OSTI ID: 6507547
• Report Number(s): ORO-4881-24; TRN: 79-004371
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ELECTRON-ATOM COLLISIONS
EXCITATION
HELIUM
COUPLING
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ENERGY LEVELS
EV RANGE 10-100
GROUND STATES
P STATES
S STATES
ATOM COLLISIONS
COLLISIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
FLUIDS
NONMETALS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena