Correction to paper by R. S. Stolarski and A. E. S. Green, ‘Calculations of auroral intensities from electron impact’

Green, A. E. S.

doi:10.1029/jz072i019p04950

Cited by 8 publications

(8 citation statements)

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“…Nevertheless, it is hoped that the information contained here will be useful for the quantitative analysis of light atoms by electron-probe microanaiysis and by Auger-electron spectroscopy. Specific formulas or parameters given here can be used directly or the present and anticipated future data can be used to fix parameters in other analytic models (Green and Stolarski, 1972) for use in transport calculations in correction procedures for quantitative analysis by EPMA and AES.…”

Section: Discussionmentioning

confidence: 99%

Cross sections for ionization of inner-shell electrons by electrons

1976

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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 microanaiysis 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 I.-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 5 U", 5 30, where U", = Eo/E", , Eo is the incident electron energy, and E", the binding energy of electrons in the nl shell.From these fits, values could be obtained of the "effective" Bethe parameters b"I and c"&. Values of the parameter b", 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 differentia oscillator strength with respect to excitation energy and the consequent expected variation of b", with incident electron energy. The derived "effective" Bethe parameters should not therefore be used outside the range of each fit.

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Section: Discussionmentioning

confidence: 99%

Cross sections for ionization of inner-shell electrons by electrons

1976

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“…It should be noted that the scattering angles are all assumed to be small and thus tracks of the primary ions are approximated with straight line trajectories; however, we calculate these angles explicitly in the code to allow for more accurate modeling of the energy lost in such nuclear-elastic collisions. For protons, ionization and excitation cross-sections are calculated using the semi-empirical Green-McNeal formula 41,42…”

Section: Protonsmentioning

confidence: 99%

A new model of the chemistry of ionizing radiation in solids: CIRIS

Shingledecker

Gal

Herbst

2017

Phys. Chem. Chem. Phys.

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The collisions between high-energy ions and solids can result in significant physical and chemical changes to the material. These effects are potentially important for better understanding the chemistry of interstellar and planetary bodies, which are exposed to cosmic radiation and the solar wind, respectively; however, modeling such collisions on a detailed microscopic basis has thus far been largely unsuccessful. To that end, a new model, entitled CIRIS: the Chemistry of Ionizing Radiation in Solids, was created to calculate the physical and chemical effects of the irradiation of solid materials. With the new code, we simulate O ice irradiated with 100 keV protons. Our models are able to reproduce the measured ozone abundances of a previous experimental study, as well as independently predict the approximate thickness of the ice used in that work.

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“…which we show in figure 2. Since the charge exchange interactions take place over distances much shorter than the overall distance the muon travels in the frictional cooling scheme, we can approximate the charge of the µ + by an effective charge according to Figure 3 shows the effective charges of µ + in helium, hydrogen, and neon for both the two-state (η 2 ) and three-state (η 3 ) systems calculated from the charge-exchange cross sections using empirical formulae from [16] fit to measured values [15]. We also show η 2 for carbon; η 3 could not be calculated since the cross sections involving the negative charge state are unknown.…”

Section: Effective Chargementioning

confidence: 99%

Frictional cooling of positively charged particles

Greenwald

Caldwell

2012

Phys. Rev. ST Accel. Beams

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One of the focuses of research and development towards the construction of a muon collider is muon beam preparation. Simulation of frictional cooling shows that it can achieve the desired emittance reduction to produce high-luminosity muon beams. We show that for positively charged particles, charge exchange interactions necessitate significant changes to schemes previously developed for negatively charged particles. We also demonstrate that foil-based schemes are not viable for positive particles.Comment: 15 pages, 6 figure

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Correction to paper by R. S. Stolarski and A. E. S. Green, ‘Calculations of auroral intensities from electron impact’

Abstract: Table 3, which should both be multiplied approximately by a factor of 4.

Cited by 8 publications

References 0 publications

Cross sections for ionization of inner-shell electrons by electrons

Cross sections for ionization of inner-shell electrons by electrons

A new model of the chemistry of ionizing radiation in solids: CIRIS

Frictional cooling of positively charged particles

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