Abstract
The electron loss and capture cross sections of carbon (σ45, σ56, σ65) and of nitrogen ions (σ45, σ56, σ67, σ76) in H2, He, N2, Ne, Ar, Kr and Xe gases were measured at energies of 3.5 to 7.5 MeV/nucl. As the result, it has been found that cross sections for singly electron loss of those energetic heavy ions agree nearly with a formula given by N. Bohr and generalized by I.S. Dmitriev who derived the formula for electron loss in a free collision approximation through a classical treatment, and that from the relation between the electron loss cross sections and the atomic number of gaseous medium Zmed, the shielding effect of target gas was observed obviously in the region of Zmed\gtrsim10. Cross sections for electron capture could not fit to previous theories, but agreed well with the calculation derived by Urata and Watanabe recently using an impulse approximation.
