Om. Artamonov et al., INVESTIGATION OF UNOCCUPIED ELECTRON-STATES AND DETERMINATION OF THE ELECTRON-AFFINITY OF PBS (100) BY INVERSE-PHOTOEMISSION SPECTROSCOPY, Semiconductors, 27(10), 1993, pp. 955-957
Isochromatic spectra of inverse photoemission from PbS (100) were dete
rmined at photon energies 3.1, 3.9, and 4.9 eV and for exciting-electr
on energies from zero to 10 eV. The dominant contribution to the inver
se photoemission spectra of lead sulfide was made by indirect transiti
ons and the spectra manifested the effects of the integral density of
unoccupied states. Isochromatic inverse photoemission spectroscopy was
used to find the electron affinity of PbS (100): e(chi)=3.5+/-0.2 eV.