Doubly differential cross sections of secondary electrons ejected from gases by electron impact. 50--300 eV on helium

Journal Article · Thu Feb 01 04:00:00 EST 1979 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.19.557· OSTI ID:6461935

Shyn, T W; Sharp, W E

Doubly differential cross sections of secondary electrons ejected from He by electron impact have been measured utilizing a crossed-beam method. The incident energies used were 50, 100, 200, and 300 eV. The energy and angular range of the secondary electrons measured were from half of the difference between incident energy and ionization energy to 1.0 eV and from 6/sup 0/ to 156/sup 0/, respectively, with an emphasis on the measurements of low-energy secondary electrons. The present results have been placed on an absolute scale by using the ionization cross section at 100 eV. The results indicate a strong forward peak for low-energy (< 5-eV) secondaries at angles less than 30/sup 0/. There is good agreement among the measurements of the high-energy secondary electrons but considerable differences exist in the measurements of the low-energy secondary electrons.

• Research Organization: Space Physics Research Laboratory, Department of Atmospheric and Oceanic Science, The University of Michigan, Ann Arbor, Michigan 48109
• OSTI ID: 6461935
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 19:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular &amp; Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
FLUIDS
HELIUM
IONIZATION
NONMETALS
RARE GASES