Cross-section measurements for electron-impact ionization of atoms

Journal Article · Sun Apr 01 00:00:00 EST 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.3575· OSTI ID:7188550

Freund, R S; Wetzel, R C; Shul, R J; Hayes, T R ^[1]

---

1. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (USA)

Absolute electron-impact cross sections have been measured from 0 to 200 eV for single ionization of 16 atoms (Mg, Fe, Cu, Ag, Al, Si, Ge, Sn, Pb, P, As, Sb, Bi, S, Se, and Te) with an estimated accuracy of {plus minus}10%. Combined with our recent measurements of He, Ne, Ar, Kr, Xe, F, Cl, Br, I, Ga, and In (Wetzel {ital et} {ital al}., Phys. Rev. A 35, 559 (1987); Hayes {ital et} {ital al}., {ital ibid}. 35, 578 (1987); Shul, Wetzel, and Freund, {ital ibid}. 39, 5588 (1989)), a set of 27 atomic single-ionization cross sections has now been measured with the same apparatus. In addition, cross sections are reported for double ionization of ten atoms and triple ionization of eight atoms. The measurements are made by crossing an electron beam with a 3-keV beam of neutral atoms, prepared by charge-transfer neutralization of a mass-selected ion beam. The critical measurement of absolute neutral beam flux is made with a calibrated pyroelectric crystal. The magnitudes of the single-ionization-peak cross sections decrease monotonically across rows of the periodic table from group IIIA (Al,Ga,In) to group VIIIA (Ar,Kr,Xe), varying much more than predicted by various empirical formulas and classical and quantum-mechanical theories.

• OSTI ID: 7188550
• Journal Information: Physical Review, A (General Physics); (USA), Vol. 41:7; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ELECTRON-ATOM COLLISIONS
IONIZATION
METALS
SEMIMETALS
ATOMIC NUMBER
BEAM-BEAM INTERACTIONS
CORRELATIONS
CROSS SECTIONS
ENERGY DEPENDENCE
EV RANGE
EXPERIMENTAL DATA
ATOM COLLISIONS
BEAM DYNAMICS
COLLISIONS
DATA
ELECTRON COLLISIONS
ELEMENTS
ENERGY RANGE
INFORMATION
NUMERICAL DATA
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena