@article{oai:repo.qst.go.jp:00043703,
 author = {Ohsawa, Daisuke and Satou, Yukio and Okada, Yuki and Shevelko, Viatcheslava and Soga, Fuminori and 大澤 大輔 and 佐藤 幸夫 and 岡田 裕樹 and 曽我 文宣},
 journal = {Physics Letters A},
 month = {Jun},
 note = {We present absolute doubly differential cross sections (DDCS) of electron emission  in collisions of 6.0 and 10.0 MeV/u He2+ ions with water vapor, in which unexpectedly large DDCS values were observed at the backward angles, particularly in the high-energy region, as well as singly differential cross sections larger than the Rudd model by a factor of 2-3 at 10 keV. The experimental results imply that these high-energy electrons are accelerated through the Fermi-shuttle acceleration. We evaluated the partial cross sections, which contribute to this acceleration, to be 7.1 and 4.5E-19 cm2, respectively, leading to -0.7% of the total ionization cross sections.},
 pages = {168--174},
 title = {Unexpectedly large cross sections of high-energy electrons ejected from water vapor by 6.0-10.0 MeV/u He2+ ions},
 volume = {342},
 year = {2005}
}