Abstract
We report measured absolute single and double charge-exchange cross sections (CSs) for Feq+ions with He at the ion impact energy of 7.0 × q keV forq = 5–13.The range of ion velocities is 350 km s−1 forq = 5, to 560 km s−1for q = 13,comparable to typical solar wind velocities. A retarding-field method is used forcharge-state analysis of the ion beam after traversing the stationary target gascell. The CSs are determined from absolute measurements of the ion currents andHe target gas pressure.
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