Anomalous behavior in differential cross sections for the 2 sup 3 S excitation in helium at minute scattering angles for fast electron collisions

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.43.1656· OSTI ID:5715699

Sakai, Y; Suzuki, T Y; Min, B S; Takayanagi, T; Wakiya, K; Suzuki, H ^[1]; Ohtani, S; Takuma, H ^[2]

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1. Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102, Japan (JP)
2. Institute for Laser Science, University of Electro-Communications Chofu-shi, Tokyo 182 (Japan)

Differential cross sections (DCS) for the 1 {sup 1}{ital S}{minus}2 {sup 3}{ital S} excitation in helium have been measured with a high angular resolution of about 1{degree} as a function of the scattering angle {theta} from 12{degree} to 0{degree} for the incident energies of 200 and 500 eV. For the incident energy of 500 eV, the DCS increases drastically as the angle decreases in the angular range smaller than 4{degree} and reaches a value 0.075 {ital a}{sub 0}{sup 2}/sr at {theta}=0{degree}, the increase being nearly 3 orders of magnitude. The DCS at zero scattering angle for impact energies from 200 to 800 eV have been measured. The DCS's are found to be about 1 order of magnitude greater than those of published measurements by Skerbele, Harshbarger, and Lassettre (J. Chem. Phys. 58, 4285 (1973)) and Klump and Lassettre (J. Chem. Phys. 62, 1838 (1975)).

• OSTI ID: 5715699
• Journal Information: Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 43:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR CORRELATION
ATOM COLLISIONS
COLLISIONS
CORRELATIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY DEPENDENCE
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 100-1000
EXCITATION
EXCITED STATES
FLUIDS
GASES
HELIUM
METASTABLE STATES
NONMETALS
RARE GASES