Development of an electron-ion coincidence apparatus for molecular-frame electron energy loss spectroscopy studies

作者：Watanabe Noboru; Hirayama Tsukasa; Yamada So; Takahashi Masahiko

来源：Review of Scientific Instruments, 2018, 89(4): 043105.

DOI：10.1063/1.5025773

We report details of an electron-ion coincidence apparatus, which has been developed for molecular-frame electron energy loss spectroscopy studies. The apparatus is mainly composed of a pulsed electron gun, an energy-dispersive electron spectrometer, and an ion momentum imaging spectrometer. Molecular-orientation dependence of the high-energy electron scattering cross section can be examined by conducting measurements of vector correlation between the momenta of the scattered electron and fragment ion. Background due to false coincidences is significantly reduced by introducing a pulsed electron beam and pulsing scheme of ion extraction. The experimental setup has been tested by measuring the inner-shell excitation of N-2 at an incident electron energy of 1.5 keV and a scattering angle of 10.2 degrees. Published by AIP Publishing.

• 出版日期2018-4