V. Nanal et al., ORIENTATION DEPENDENCE OF THE PROJECTILE X-RAYS FROM HIGHLY STRIPPED S AND CL IONS CHANNELED ALONG [100]SI CRYSTAL, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 115(1-4), 1996, pp. 184-186
The hyper (normal) projectile K-alpha(h)(K-alpha(n)) X ray yield exhib
its a maximum close to half the critical angle for channeling (psi(c)/
2) for fully stripped S (hydrogen-like S and Cl) ions channeled along
the [100] axis of a 0.17 mu m Si single crystal. This can be qualitati
vely understood in terms of the interplay between the freezing of the
incident charge states and the electron density sampled by the channel
ed ions.