The charge stripping cross sections for 18 Ar q+ (q=3,4) by collision with neutral atoms H and He, potential functions and electron momentum distributions are calculated by using Binary Encounter and Thomas Fermi Approximations.

In the text the caculation formulae and computational programse can calculate charge stripping cross sections for any one of the multi charge ions \%A\% q+  by col.

The heavy ion beam energy,as well as the charge stripping efficiency,was calculated by using the charge state stripping formula and empirical formula of stable isotope mass number.

Through this theory, the formulation of the H" photodetachment cross section is deduced under strong electric and magnetic fields with arbitrary orientation, and the photodetachment cross sections of H" with different degrees are calculated.

The electron-impact ionization cross section for metastable state ion;

By using a distorted_wave Born exchange approximation method in averaged_atomic model, we calculated the direct excitation and direct ionization cross sections of several ions in plasmas.

By using a distorted\|wave Born exchange ( DWBE ) approximation method including the relativistic correction, we calculated the direct ionization and excitation autoionization cross sections of eight Na\|like ions.

K-shell ionization cross sections of Zr element at energies from 20keV to 34keV;

K shell ionization cross sections of Ti and V elements from the measured result of K α X rays using the spectrometer are derived.