Cross sections for ionization of inner-shell electrons by electrons

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Rev. Mod. Phys.; (United States)

DOI:https://doi.org/10.1103/RevModPhys.48.33· OSTI ID:7347332

Powell, C J

A survey is given of the available cross-section data for ionization of inner-shell electrons by incident electrons in the range of interest for electron-probe microanalysis and for Auger-electron spectroscopy of solid surfaces. Owing to the paucity of data, the bulk of the discussion is limited to K-shell and L-shell ionization of light atoms. Calculated, semiempirical, and experimental cross-section data have been intercompared graphically and through fits to the linearized Bethe equation for inner-shell ionization (the Fano plot). Almost all of the data could be satisfactorily fitted over the range 4 approx.greater than or equal to U/sub nl/approx.greater than or equal to 30, where U/sub n/=E/sub 0//E/sub nl/, E/sub 0/ is the incident electron energy, and E/sub nl/ is the binding energy of electrons in the nl shell. From these fits, values could be obtained of the ''effective'' Bethe parameters b/sub nl/ and c/sub nl/. Values of the parameter b/sub nl/ have also been derived from photoabsorption data and were found to be generally consistent with the ionization data if account was taken of the distribution of differential oscillator strength with respect to excitation energy and the consequent expected variation of b/sub nl/ with incident electron energy. The derived ''effective'' Bethe parameters should not therefore be used outside the range of each fit. (AIP)

• Research Organization: National Bureau of Standards, Washington, D.C. 20234
• OSTI ID: 7347332
• Journal Information: Rev. Mod. Phys.; (United States), Journal Name: Rev. Mod. Phys.; (United States) Vol. 48:1; ISSN RMPHA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
AUGER ELECTRON SPECTROSCOPY
BEAMS
CHEMICAL ANALYSIS
COLLISIONS
CROSS SECTIONS
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON MICROPROBE ANALYSIS
ELECTRON SPECTROSCOPY
ELECTRON-ATOM COLLISIONS
ENERGY RANGE
IONIZATION
KEV RANGE
LEPTON BEAMS
MICROANALYSIS
PARTICLE BEAMS
PHOTOIONIZATION
SPECTROSCOPY
SURFACES