L3-subshell alignment in gold and bismuth induced by low-velocity carbon ions.

Abstract

Angular distribution of the ${\mathit{L}}_{\mathit{l}}$ x-ray line (3${\mathit{s}}_{1/2}$\ensuremath{\rightarrow}2${\mathit{p}}_{3/2}$) in Au and Bi induced by 3--9 MeV carbon ions has been measured. Values of the alignment parameter (${\mathit{A}}_{2}$) of the ${\mathit{L}}_{3}$(2${\mathit{p}}_{3/2}$) subshell have been obtained from the data as a function of the carbon ion energy. The data have been compared with the calculations of the standard perturbed-stationary-state (PSS) theory with energy-loss (E), Coulomb deflection (C), and relativistic (R) corrections (ECPSSR) and ECPSSR with the intrashell (IS) effect included as a multiplicative factor. From this comparison it is evident that an account for the IS coupling substantially improves agreement between theory and measurement. The effect of simultaneous multiple ionization of the M and higher shells on the measured ${\mathit{A}}_{2}$ values is discussed. \textcopyright{} 1996 The American Physical Society.