In 64-MeV S 5+ + He and 90-MeV Sc 8+ + He collisions, the light target atom He was used to excite or ionize selectively the L shell of the sulfur and scandium projectiles. The subsequent L-shell Auger emission from Na-like S 5+ and Mg-like Sc 9+ was measured with high resolution using zero-degree Auger spectroscopy. For 64-MeV S 5+ + He collisions, the spectra are dominated by the line groups attributed to the configurations 1s 2 2s 2 2p 5 3snl forn > 3. For 90-MeV Sc 8+ + He collisions, the spectra are dominated by the three peak groups that are attributed to the transitions from 1s 2 2s 2 2p 5 3s 2 3p to 1s 2 2s 2 2p 6 3s, 1s 2 2s 2 2p 6 3p, and 1s 2 2s 2 2p 6 3d. It was found that the last Auger transition for Sc 9+ involves three electrons via electron correlation and this result was compared with the previous results for the isoelectronic ions of Al + and Ar 6+ .