Electron loss and capture cross-sections of 1.0–3.5 MeV H⁰ and H⁺ in carbon foils

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• 作者：Ogawa ; H. ; Sakamoto ; N. ; Tsuchida ; H.
• 关键词：34.70.+e ; 34.50.&ndash ; s ; 34.50.Fa ; Charge state distribution ; Electron loss ; Electron capture
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2000
• 出版时间：April, 2000
• 年：2000
• 卷：164-165
• 期：Complete
• 页码：279-283
• 全文大小：128 K

文摘

The attenuation of H⁰ beam transmitted thin carbon foils of 2–20 μg/cm² in thickness was measured in the incident energy range from 1.0 to 3.5 MeV. Considering two components of H⁰ in the ground state and H⁺, the electron loss cross-sections of H⁰ and the electron capture cross-sections of H⁺ were derived from the measured foil-thickness dependence of the transmitted H⁰ yields. Both the present electron loss and electron capture cross-sections are larger than those obtained below 2.4 MeV with quite similar experimental methods by Gaillard et al. The present results are also slightly larger than the values below 2.5 MeV derived by applying an additivity rule to the measured charge changing cross-sections with various carbon-containing gas targets by Toburen et al. The theoretical prediction based on the Born approximation by Gillespie is found to give an excellent agreement with our electron loss cross-sections. As for the electron capture cross-section, although the OBK approximation gives slightly larger values, it can well reproduce the obtained incident energy dependence.