Simple Phenomenological Model for the Interpretation of Ion Neutralization Spectra.

摘要

We present here an extention of Hagstrum's model for the interpretation of ion neutralization spectra. We take into account the fact that the neutralization process depends on both the density of states and the orbital size and takes place continuously at all surface-ion seperation distances at which the ion and metal orbitals overlap. The model is applied to the calculation of the density of states of the Ni(111) surface. In this paper we have developed a practical method for the analysis of ion neutralization spectra. This was stimulated by the fact that metastable quenching spectroscopy can generate with ease IN spectra at low incident kinetic energy. The extension presented here is necessary when the orbitals of various bands have different spatial extent, so that the Auger process is controlled not only by the density of states but also by the relative orbital length scales. It is generally true that two electron spectroscopic methods are measuring convolutions of the desired quantities are at a disadvantage when compared to their one electron competitors, since some of the details might be lost in the deconvolution process. However, if interpreted carefully IN can be a useful complement to photoelectron spectroscopy due to its extreme surface sensitivity.