Cross sections for hydrogen and helium ionization by impacts of fast highly charged ions

Collisions of hydrogen and helium atoms with fast highly charged ions are considered for the range of parameters (Z and v are the ion charge and velocity, respectively; is the orbital velocity of atomic electrons; is a characteristic atomic time; , c is the speed of light). Formulae have been derived for cross sections of hydrogen and helium (single and double) ionization. A formula has also been obtained for cross sections of hydrogen excitation into discrete states.

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