Electron Correlation and Hole Localization in Photon-Stimulated Ion Desorption from Solid ${\mathrm{N}}_2$, CO, and ${\mathrm{C}}_2$${\mathrm{H}}_2$

Results of photon-stimulated ion-desorption measurements from solid ${\mathrm{N}}_2$, CO, and ${\mathrm{C}}_2$ ${\mathrm{H}}_2$ are presented in the photon energy range $17<h\nu <35\mathrm{}$ eV. The photon energy dependence of the ion yields illustrates the importance of electron correlation in desorption. On the surface of solid ${\mathrm{N}}_2$, charge localization on the nitrogen atom nearest the surface causes the ${\mathrm{N}}^{+}$ spectral yield to differ from the ${\mathrm{N}}^{+}$ yield from gaseous ${\mathrm{N}}_2$ and to resemble the ${\mathrm{O}}^{+}$ yield from CO. The effect of hole migration on desorption from physisorbed systems is discussed.