Projectile charge-state dependence of K-shell ionization by silicon ions: A comparison of Coulomb ionization theories for direct ionization and electron capture with x-ray production data

X-ray-production cross sections measured in K-shell ionization of 21Sc, 22Ti, 29Cu, and 32Ge by 52-MeV 2814Si/sup [q/ projectiles with q = 7 to 14 are reported, which demonstrate, through their charge-state dependence, the validity of a recently developed electron-capture theory with a reduced binding effect. Furthermore, the data provide evidence for the applicability of the perturbed stationary-state theory of direct ionization for values of 0.44 < or = Z1/Z2 < or = 0.67