Cascade theory for double K x-ray emission in transfer and excitation collisions

We propose a cascade model to interpret a recent, novel experiment of S/sup 15+/+H2 collisions with simultaneous excitation capture in which two K x rays were detected. Cascade effects leading to double K x-ray emission are carefully examined to obtain Kα-Kα, Kα-Kβ, and Kα-Kγ (and higher states) coincidence cross sections. The overall spectral shapes and absolute magnitudes are consistent with the predictions of the model