Abstract
A photoelectron spectrometer designed specifically for measuring the angular distributions of valence shell electrons from gaseous molecules has been constructed. Positioning of the wide-angular-range analyser/detector is done with a potentiometric servo-system. The voltages for both this and the energy scan potential are derived from a small on-line computer, which also counts the signal pulses so that the instrument operation is fully automated. The same computer is used in the spectral analyses so that no manual recording or transfer of data is required. The performance of the spectrometer is illustrated by sample results obtained with argon.
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