IMPORTANCE OF SUBSHELL COUPLING IN L-SHELL IONIZATION BY LOW-VELOCITYHEAVY-IONS

Data for available L-subshell ionization caused by slow and heavy ions (Z(1) = 6, 7 and 8) are compiled and compared with the predictions of the ECPSSR theory with and. without the intra-shell (IS) coupling. It has been observed that the standard ECPSSR without IS is inadequate t o predict quantitatively the L-subshell cross section data at low proj ectile velocities. The inclusion of the IS effect somewhat worsens agr eement with experiment for the L(1)-subshell ionization, substantially improves it for the L(2), subshell, and plays essentially no role in an analysis of L(3)-subshell data which are fairly well predicted by t he standard ECPSSR theory. The quantitative validity of such conclusio ns may be questioned because they rely on an approximate treatment of the IS effect.