PATH-DEPENDENT NEUTRALIZATION OF NE+ AND NA+ SCATTERED FROM AG(001)

Recent surface crystallographic studies involving impact collision ion scattering spectroscopy (ICISS) have utilized beams of Nef ions as th e probe and an electrostatic analyzer as the detector. The data were a nalyzed under the assumption that the path dependent neutralization co uld be neglected for scattered Ne+ ions of at least 4 keV incident kin etic energy. We have investigated this assumption by collecting energy and angle dispersive ICISS distributions with a time-of-flight analyz er while separating the ion and neutral yields by application of a pot ential to the free flight region. This investigation shows that both 5 and 10 keV Ne+ scattered from Ag(001) display considerable path-depen dent neutralization, but that of Na+ is very small.