ELECTRON-EMISSION IN COLLISIONS OF SLOW, HIGHLY CHARGED IONS WITH GASES AND SOLID-SURFACES

We measured electron spectra produced in O6+ + He collisions and by N6+, O7+, Ne9+, and Ar(q+) (q = 9, 13, 14 and 16) incident on solid surfaces of Cu and C under 10-degrees with energies from 10q to 20q keV. Auger electrons were detected at various emission angles including 0-degrees and 180-degrees with respect to the incident beam. For the He gas target the angular distribution of oxygen L-Auger electrons is found to be isotropic between 10-degrees and 140-degrees but enhanced at 0-degrees. In ion-surface collisions, multiple electron capture is studied. By analyzing the Doppler shift of the projectile Auger electrons, the L-Auger electrons of argon were found to be emitted from ions incident on the surface and the K-Auger electrons of neon were observed to be emitted from reflected ions.