Fourier transform photoelectron spectroscopy

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Abstract
This paper describes a new method of data acquisition and analysis for photoelectron spectroscopy (ESCA/UPS). Rather than sweeping through a preset range of energies at a constant rate accumulating count rates at each energy, nonlinear sweeps are used for each Fourier coefficient of the spectrum. Compared to conventional scan mode, this method offers two advantages: (1) The noise contents of each Fourier coefficient can be predetermined by setting the length of the sweep interval. This is very helpful for the subsequent application of deconvolution techniques because they amplify the contribution of higher order components. Using time efficiently, the noise contents of these components can be reduced more than the noise of lower order contributions. This is not possible for spectra taken by normal means because their noise spectra are flat. (2) Much time can be saved by not recording higher order Fourier coefficients whose contribution to the spectrum is negligible. A data acquisition system for ESCA has been developed to test these advantages. Spectra taken by conventional scan mode and by Fourier transform photoelectron spectroscopy (FTPS) are presented for comparison.

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