Total charge-exchange cross section versus velocity of incident impactor: (a) α particles in reaction (8) He2+ + H2O and (b) protons in reaction (14) H+ + H2O. For He2+ impact on H2O, the data at 400 km s-1 (blue dot) of Greenwood et al. (2004) is used. For a proton impact at 400 km s-1, the interpolated experimental value of (Lindsay et al. 1997; red dot) lies between the “ORNL” recommendation of Barnett et al. (1990) and the theoretical curve of Mada et al. (2007). The experimental values of Berkner et al. (1970) and Cable (1970) are displayed for comparison with uncertainties.
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