Mlm. Rocco et al., VALENCE-SHELL ANGLE-RESOLVED ELECTRON-ENERGY-LOSS SPECTRA OF SF6, Journal of the Brazilian Chemical Society, 9(3), 1998, pp. 287-293
Electron-energy-loss spectra of the SF6 molecule have been measured in
the valence-shell region (0 - 100 eV) covering an angular range of 1.
0 degrees - 15.0 degrees. The spectra have been measured at an impact
energy of 1.0 keV. The angular dependence of the spectra showed the pr
esence of three forbidden transitions in the region below 40 eV. Above
40 eV interesting features appear at higher scattering angles, which
can be associated to nondipole many-body processes. A new feature was
observed at 76 eV, The absolute elastic differential cross section has
been obtained through normalization of the relative data to the exper
imental values found in the literature. The absolute inelastic differe
ntial cross sections for the 11.5 eV and 13.2 eV transitions have been
determined. The generalized oscillator strength (GOS) for the 11.5 eV
peak has been also determined in the 0.05 to 1.3 a.u. K-2 range. The
experimentally determined value for the optical oscillator strength (0
.312) for the 11.5 eV peak obtained through extrapolation of the GOS c
urve showed good agreement with the data found in the literature.