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

Journal Article · · Phys. Rev. A; (United States)
; ;
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-31109-ENG-38
OSTI ID:
6037367
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:11; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

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