Abstract
Equilibrium charge-state distributions observed for chlorine, bromine and iodine ions after passing through gaseous targets (Zt>or approximately=7) with an energy per nucleon in the range 20-500 keV amu-1 are very well fitted by a simple statistical distribution: a three-parameter chi-squared model. The three parameters are elementary functions of the mean, the standard deviation and the skewness of the distribution. Equilibrium charge-state distributions for heavy ions (Zp>or=17) in gases may generally be predicted with a good approximation by this chi-squared model (particularly the proportions of ions having a very high charge-state which have generally not been measured) even if only the mean charge state of the distribution can be precisely estimated.
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