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- W2014469673 abstract "view Abstract Citations (50) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Energy Degradation of Fast Electrons in Hydrogen Gas Xu, Yueming ; McCray, Richard Abstract An equation is derived for calculating the energy distribution of fast electrons in a partially ionized gas and a method is provided to solve for the electron degradation spectrum and the energy deposition in different forms (ionization, excitation, or heating). As an example, the energy degradation of fast electrons in a gas of pure hydrogen is calculated, considering excitations to the lowest 10 atomic levels. The Bethe approximation and the continuous slowing-down approximation are discussed and it is concluded that these approximations are accurate to the order of 20 percent for electrons with initial energy of greater than about keV. The method and results can be used to determine heating, excitations, and ionizations by high-energy photoelectrons or cosmic-ray particles in various astrophysical circumstances, such as the interstellar medium, supernova envelopes, and QSO emission-line clouds. Publication: The Astrophysical Journal Pub Date: July 1991 DOI: 10.1086/170180 Bibcode: 1991ApJ...375..190X Keywords: Cosmic Rays; High Energy Electrons; Hydrogen; Ionized Gases; Particle Acceleration; Photoelectrons; Approximation; Energy Distribution; Energy Levels; Molecular Excitation; Photoionization; Astrophysics; ATOMIC PROCESSES; COSMIC RAYS: GENERAL; PARTICLE ACCELERATION full text sources ADS |" @default.
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- W2014469673 date "1991-07-01" @default.
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- W2014469673 title "Energy degradation of fast electrons in hydrogen gas" @default.
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