Abstract
Cross sections for the production of positive ions and electrons and for the capture and loss of electrons by 5--450-keV He/sup +/ ions making collisions with water-vapor molecules have been measured. The ionization cross sections sigma/sub +/ and sigma/sub -/ were measured by the transverse-field method and the electron-capture and -loss cross sections sigma/sub 10/ and sigma/sub 12/ by electrostatic separation of the beam components after passing through a known length of target gas. The four cross sections were adjusted to satisfy the equation sigma/sub +/-sigma/sub -/ = sigma/sub 10/-sigma/sub 12/. .AE
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