Abstract
Two methods for the quantitative determination of the surface coverage of adsorbates on single crystal surfaces are discussed. In the first case a quartz crystal microbalance is used to calibrate an Auger spectrometer. The frequency change of the quartz and the Auger signal of the adsorbate are measured simultaneously during adsorption. With the calibrated Auger spectrometer the absolute coverage of oxygen on Ni (110) and Ni (111) is determined. The second method is used for adsorbates which can be thermally desorbed. The desorption spectra of the sample are compared with the calibration spectrum. This test spectrum can be obtained by introducing a well defined amount of gas into the vacuum chamber. The gas introduced produces a pressure increase comparable to a flash desorption spectrum. With this method the saturation coverages of H2-Ni (111), H2-Ni (100) and H2-W (100) are determined.
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