Generalized oscillator strengths for inner-shell excitation of SF_6 recorded with a high-performance electron energy loss spectrometer

摘要

The generalized oscillator strength profiles for S 2p, S 2s and F 1s excited and ionized states of sulfur hexafluoride (SF_6) are reported up to very high momentum transfer. These have been measured with a variable impact energy, variable scattering angle electron energy loss spectrometer, which is dedicated to studies of electric dipole (optically allowed) and non-dipole (optically forbidden electric quadrupole and spin-exchange) inner shell electronic transitions of gases, and systematic measurements to their angular and impact energy distributions in order to derive generalized oscillator strength profiles. In addition of presenting the SF_6 results, we describe the design, construction and performance of the instrument, as well as data acquisition and analysis procedures.