A simple physical model of nonlinear dependence of helium stopping power on the velocity of low-energy hydrogen ions

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For the first time, the dependence of the probability of ionization of helium atoms on the velocity of a low-energy hydrogen ion beam is taken into account when the first ionization potential of target atoms exceeds the ionization potential of the charged particle beam atoms. Formulae describing the dependences of the helium stopping power on the beam energy of monoenergetic protons and deuterons are obtained. It is shown that their application makes it possible to calculate the helium stopping power adequately to the available experimental results.

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N. Mikheev

Shubnikov Institute of Crystallography, Kurchatov Complex of Crystallography and Photonics, National Research Centre “Kurchatov Institute”

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Email: kmikran@spark-mail.ru
俄罗斯联邦, Kaluga

参考

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2. Fig. 1. Stopping power Se of molecular hydrogen for a beam of monoenergetic protons: solid curve − calculation according to formulas [9]; dots − Se measurements [14–20].

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3. Fig. 2. Stopping power of Se of helium for a proton beam: solid curve − calculation using formulas (1) and (2); dashed curve − calculation using formulas [9]; crosses − data from [1]; circles − data from [21].

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4. Fig. 3. Stopping power Se of helium for a deuteron beam: solid curve − calculation using formulas (1) and (2); crosses − data from [2]; circles − data from [21].

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