Abstract
The method of Disappearance Potential Spectroscopy (DAPS) as electron spectroscopy for surface studies is described. A short historical survey of the development of threshold spectroscopies is given and the relationship of DAPS with the Appearance Potential Spectroscopy (APS) is discussed. A description of several types of experimental equipment together with the electronic circuitry and typical experimental conditions are given. DAPS is applied to the elemental analysis of multicomponent surfaces, to the investigation of clean surfaces and to the oxidation of a vanadium surface. Comparisons are made with other electron spectroscopies such as Auger Electron Spectroscopy, Ionisation Loss Spectroscopy and Auger Electron Appearance Potential Spectroscopy and some special properties of DAPS such as elemental sensitivity and surface sensitivity are discussed.
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