Developing New Routine for Processing Two-Dimensional Coincidence Doppler Energy Spectra and Evaluation of Electron Subsystem Properties in Metals
P.S. Stepanova, S.V. Stepanovb,c,d, V.M. Byakovb,d,e, F.A. Selim a
aCenter for Photochemical Sciences, Bowling Green State University, OH, USA
bNRC "Kurchatov Institute" - Institute for Theoretical and Experimental Physics, B. Cheremuskinskaya st., 25. 117218 Moscow Russia
cNational Research Nuclear University "MEPhI", 115409, Moscow, Russia
dLomonosov Moscow State University, Chemical Department, Leninskie Gory, Moscow, Russia
eD. Mendeleyev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047, Moscow, Russia
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A digital coincidence Doppler broadening (CDB) spectrometer consisting of two HPGe detectors is assembled; The energy resolution of each detector is 1.1 keV at energies near the annihilation line. Two desktop applications for CDB spectra processing are developed. TLIST Processor converts two-dimensional CDB spectra into one-dimensional spectra. Another tool SW Calculator deconvolutes the experimental CDB spectra into contributions from positron annihilation with valence, core and conduction band electrons. The program estimates the energies of the corresponding electrons and evaluates S and W parameters of the CDB spectra.

DOI: 10.12693/APhysPolA.132.1628
topics: Positron annihilation, Doppler broadening, metals, core electrons