Ph. Avouris, P.S. Bagus, et al.
Journal of Electron Spectroscopy and Related Phenomena
We present results on the effect of potassium co-adsorption on the ESD from CO and NO on Ni(111) at 90 K. K co-adsorption strongly affects the yields of positive ions and alters their electron beam energy dependence. At a K-coverage of θK = 0.25 and saturation coverages of CO or NO, the strong O+ ESD threshold associated with O 1s ionization is eliminated. We attribute this to increased metal → CO(2π{black star}) electron back-donation upon K addition which screens the O 1s hole, and reduces the excitation probability of shake-off/shake-up processes responsible for O+ ESD. For fixed K-coverage, the ESD yields depend on adsorbate coverage. For θK = 0.25 and CO or NO exposures <1 L the adsorbate state is ESD inactive at both valence- and core-excitation energies. © 1986.
Ph. Avouris, P.S. Bagus, et al.
Journal of Electron Spectroscopy and Related Phenomena
H.R. Shea, R. Martel, et al.
Microelectronic Engineering
J.C. Tsang, Ph. Avouris, et al.
Journal of Electron Spectroscopy and Related Phenomena
Ph. Avouris, N.J. Dinardo, et al.
The Journal of Chemical Physics