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Ejected electron spectra from highly excited states in high-energy collisions of O$$^{q+}$$ with He

O$$^{q+}$$とHeの高エネルギー衝突における高励起状態からの電子スペクトル

川面 澄*; 高広 克巳*; 今井 誠*; 左高 正雄; 小牧 研一郎*; 柴田 裕実*

Kawatsura, Kiyoshi*; Takahiro, Katsumi*; Imai, Makoto*; Sataka, Masao; Komaki, Kenichiro*; Shibata, Hiromi*

東海研タンデム加速器を利用し高エネルギー領域における0度電子分光法により、ヘリウム原子との衝突による、酸素多価イオン(電荷3$$^{+}$$から5$$^{+}$$)からの放出電子スペクトルを測定し、オージェ電子とコスタークロニッヒ電子を同定した。低エネルギー領域においては励起状態は電子捕獲によって励起が起こりやすいが、高エネルギー領域では高励起状態は電子励起で起こりやすい。われわれは低エネルギー衝突による励起と比較し、オージェ電子スペクトルは低エネルギー衝突の場合とは異なっている。コスタークロニッヒ電子スペクトルでも低エネルギーの場合とは異なり、高エネルギー領域では励起状態は比較的低角運動量状態にあることを見いだした。

Auger and Coster-Kronig electron spectra from highly excited states produced by low-energy highly charged ions with gas targets have been investigated both theoretically and experimentally. In this case, the highly excited states were formed by electron capture processes. We have studied collision processes of high-energy highly charged ions with a gas target using zero-degree electron spectroscopy at the tandem accelerator of JAERI, Tokai. In the present, we have measured Auger and C-K electron spectra from highly excited states produced by 1-3 MeV/u O$${q+}$$ (q=3-5) + He collisions, where the highly excited states in Oq+ ions were formed by electron excitation. We have compared and discussed the Auger and C-K electron spectra obtained by electron-capture and electron-excitation processes. It is found that the C-K spectra for high-energy Oq+ ions show relatively low-l states and the Auger spectra also have different structures from those for low-energy highly charged Oq+ ions.

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パーセンタイル:33.73

分野:Instruments & Instrumentation

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