ZnK- and PbL-shell ionization by proton andHe3-ion bombardment

Absolute cross sections and excitation functions have been measured for Zn $K$-x-ray production by proton impact and for Pb $L$-x-ray production by proton and ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-ion impact over the bombarding energy range from 1.4 to 4.4 MeV using a Si(Li) detector. The total ionization cross sections for the Zn $K$ shell and x-ray production cross sections for the Pb $L$ shell obtained are compared with the binary-encounter approximation (BEA) and the plane-wave Born approximation calculations and the agreement is found to be good. X-ray production ratios, such as $\frac{L\alpha }{L\beta }$ and $\frac{L\alpha }{L\gamma }$, for Pb are also compared with the BEA calculations. The cross-over behavior of the $Z_1$ (projectile nuclear charge) dependence of the x-ray production cross sections was studied for the Pb $L$ lines.