Electron degradation and yields of initial products: V. Degradation spectra, the ionization yield, and the Fano factor for argon under electron irradiation

Journal Article · Thu Jun 01 00:00:00 EDT 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.5545· OSTI ID:6037367

Kowari, K; Kimura, M; Inokuti, M

The electron-degradation spectrum is fundamental for describing a variety of quantities bearing on electron slowing-down processes in matter. We calculate the electron-degradation spectrum in Ar gas by solving the Spencer-Fano equation, using a realistic set of cross sections. The influence of Auger electrons on the degradation spectrum is studied in detail. As an application, we study the statistical fluctuations in the ionization yield, which are expressed in terms of the Fano factor /ital F/(/ital T/) for an electron incident at fixed energy /ital T/. The energy dependence of /ital F/(/ital T/) is greatly influenced by /ital L/-shell ionization. The Fano factor approaches an asymptotic value of 0.16 at /ital T/=2 keV. Our results are consistent with experimental results.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439(US)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6037367
• Journal Information: Phys. Rev. A; (United States), Vol. 39:11
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON
CHARGED-PARTICLE TRANSPORT
ELECTRONS
ENERGY LOSSES
AUGER EFFECT
ELECTRON-ATOM COLLISIONS
FANO FACTOR
INNER-SHELL IONIZATION
SPENCER-FANO THEORY
STOPPING POWER
ATOM COLLISIONS
COLLISIONS
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
GASES
IONIZATION
LEPTONS
LOSSES
NONMETALS
RADIATION TRANSPORT
RARE GASES
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments