The electronhyphen;impact excitation spectra of uranium hexafluoride (UF6) and tungsten hexafluoride (WF6) have been studied experimentally at impact energies of 30, 50, and 75 eV and at scattering angles from 5deg; to 80deg;. Eleven features in UF6are observed with maxima at 3.26, 4.2, sim;4.7, 5.8, 7.0, 7.86, 9.26, 11.01, 11.75, 12.5, and 13.2 eV. Four features in WF6are observed with maximum intensity at 7.25, 7.9, 8.5, and 9.85, in good agreement with optical work. In addition, three previously unobserved features in WF6at 11.75, 12.6, and 13.5 eV are reported. Similarity between the spectra of UF6and WF6suggests that the primary contribution to the absorption intensity in UF6above 5.8 eV and in WF6results from charge transfer transitions from fluorineporbitals to metaldorbitals. Tentative assignments based in part on recent theoretical studies are made.
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