Absolute Generalized Oscillator Strength Profiles of Rydberg Transitions in C2F6

Absolute generalized oscillator strengths (GOSs) for the two Rydberg excitations at 12.1 eV and 13.5 eV in C2F6 have been determined as functions of energy loss and momentum transfer (K) at impact energy of 2.5 keV. The GOS profiles for these two Rydberg transitions to 3p Rydberg orbital have the characteristic dipole-dominated shapes with a strong maximum at K=0.     

Absolute Generalized Oscillator Strength Profile of Negative Ion Resonance at 8.9 eV in C2F6

A temporary negative ion resonance at 8.9eV in C2F6 has been clearly identified using angle-resolved electron energy loss spectroscopy at 2.5 keV impact energy, and can be attributed to electron capture into 1^2a1u, 1^2a1g, 2^2a2u, and 1^2eg ,yirtual molecular orbitals. The corresponding absolute generalized oscillator strength profile is found to have a shape characteristic of non-dipole interaction with the maximum K - 0.8 a.u. of momentum transfer.