Volume correction factor in electron-Indium atom scattering experiments

Abstract

In crossed electron beam - Indium atom beam scattering experiments the measured signal arises from a spatial region (the 'interaction volume') defined by the overlap of the electron and target atom beam and the view cone of the detector. The exchange of the interaction volume with the scattering angle, named a volume correction factor is discussed. The approach of R. T. Brinkmann and S. Trajmar (J. Phys. E 14, 245-254 (1981)) is adopted for our experimental conditions to determine the volume correction factor and accordingly to transfer angular distributions of scattered electrons to relative differential cross sections

Electron-impact excitation of the ( 5s25p ) P1/22→Hamilton1, Zatsarinny2, Bartschat3 et al. 2020Phys. Rev. A5090View full textAdd to dashboardCite

“…2(a)] do we find a serious discrepancy in the magnitude of the DCSs between our calculations and measurement, although the shape accord between theory and experiment remains qualitatively very good. One possible experimental explanation for this discrepancy is if, despite our best efforts, our effective path-length correction factor [45] for 10 eV was a little inaccurate. From the theoretical side, the fact that the diverse calculations are in such agreement indicates that convergence with increasing number of states in the close-coupling expansion has been reached to sufficient accuracy.…”

“…This entire procedure is, at the required E 0 , repeated three to five times and on different days, with the weighted mean of the relative DCSs of those measurements subsequently being determined. The resulting angular distribution is then multiplied by the effective path-length (or volume) correction factor [43,44], as previously determined, at the same E 0 , by Rabasović et al [45]. The absolute scale of that angular distribution is then determined, at 20, 40, 60, 80, and 100 eV, respectively, by measurement of the 6s inelastic to elastic intensity ratios at 10 • (for each E 0 ) and then using the absolute values of the elastic DCS from Rabasović et al [13].…”