Electron-impact energy dependence of the sodium K-shell double-ionization cross section: A study of hypersatellite spectra

Journal Article · Mon Jun 01 04:00:00 EDT 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.35.4505· OSTI ID:6604413

Auerhammer, J; Genz, H; Kilgus, G; Kumar, A; Richter, A

The K..cap alpha../sub 2//sup h/ (L/sup -//sup n/; n = 0--5) hypersatellite spectrum of sodium has been detected for various electron-impact energies in the range of 15 less than or equal to E/sub 0/ less than or equal to 200 keV. The measured energies of the transitions are in agreement with results of previous experiments at low electron energies and theoretical predictions. For the strongest hypersatellite, which corresponds to a K/sup -2/..-->..K/sup -1/L/sup -1/ transition, the natural width has been determined. The natural linewidth was found to be GAMMA/sub K//sup h/ = 2.2 +- 0.4 eV, which is much larger than predicted. Furthermore, the electron double-ionization cross section of the K shell has been obtained. Within the investigated energy region the cross section decreases by about a factor of 4 with increasing electron-impact energy. This energy dependence suggests the dominance of direct double ionization in comparison to the shake-off process.

• Research Organization: Institut fuer Kernphysik, Technische Hochschule Darmstadt, 6100 Darmstadt, West Germany
• OSTI ID: 6604413
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 35:11; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
INNER-SHELL IONIZATION
IONIZATION
IONS
K SHELL
LINE WIDTHS
METALS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MULTICHARGED IONS
SODIUM