Au L-shell ionization by Si and S ions: Integral and differential cross sections and alignment

We present the following experimental results on Au L-shell ionization: (1) in the bombarding energy range 0.25—2.5 $\text{MeV}\text{u}$, absolute X-ray yields and the L₃-vacancy integral alignment for Si, and cross section ratios $\text{σ2}\text{σ3}$ for Si and S as projectiles; (2) MeV sulphur energy, subshell ionization probability ratios and the components A₂₀(b) and A₂₂(b) of the statistical tensor descr the L₃-vacancy for impact parameters b = 20–450 fm. A comparison of the data to SCA calculations reveals, except perhaps for the differential alignment, important discrepancies relative to the theoretical predictions. These discrepancies, increasing at lower projectile velocities, are most probable due to the mutual L-subshell coupling, as well as to the rotational coupling between the L₃ magnetic substates during the collision.