Abstract
Very recently, Ohsawa et al. have presented a new experimental apparatus for measuring doubly differential cross sections of electron emission from water vapor with fast heavy-ion impact (6-25 MeV). Successful measured energy and angular distributions of secondary electrons were produced for a collision of 6.0 MeV/u He{sup 2+} ions with vapor water [Nucl. Instrum. Methods Phys. Res. B 227, 431 (2005)] and for 10.0 MeV/u He{sup 2+} ions [Phys. Rev. A 72, 062710 (2005)]. The present theoretical work aims to reproduce these very recent measurements as well as more former existing data dedicated to low-energy alpha particles. Doubly, singly differential, and total ionization cross sections have then been studied.
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