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An angleresolving photoelectron spectrometer for the simultaneous measurement of cross sections and asymmetry parameters using synchrotron radiation Rev.Partial photoelectron cross sections 0' and angular distribution parameters {3 were obtained for the first five valence orbitals in CF 4 : It l , 4t 2 , Ie, 3t 2 , and 40 1 , asa function of photon energy from 17 to 70 eV. These data were taken with the aid of angle-resolved photoelectron spectroscopy and synchrotron radiation. The results were compared with earlier data on CCI 4 • Substantial differences were found. These are explained partly in terms of the absence of a Cooper minimum with a fluorine compound as opposed to the presence of a Cooper minimum with chlorine compounds and partly in terms of the position of shape resonances. Data on CF 4 were also compared with recent calculations of Stephens et al., who used the multiple-scattering Xa method. Structure in the photoelectron spectrum of CF 4 lying on the low energy side of the third band was identified as due to autoionization and evidence is given as to its specific nature.

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