THE INTERPRETATION AND APPLICATION OF 2-DIMENSIONAL PHOTOELECTRON-SPECTROSCOPY

The technique of two-dimensional photoelectron spectroscopy, in which photoelectron yield is measured as a function of both electron and pho ton energy, is explained. The appearance of autoionising resonance fea tures is modelled under a variety of experimental conditions. Although two-dimensional spectra normally provide a large amount of detailed i nformation, it is often necessary to extract one-dimensional spectra i n order to perform comparisons with other work. The extraction procedu re is considered using the specific example of constant transition ene rgy spectra, which indicate the population of particular ion states as a function of photon energy, In addition, experimental effects that a re readily visible in two-dimensional spectra, but which may be hard t o identify in one-dimensional measurements, are highlighted. Represent ative two-dimensional spectra are presented in order to illustrate the se points with real examples. (C) 1998 Elsevier Science B.V, All right s reserved.