10 eV photon detector for inverse photoemission

Abstract

An energy-selective photon detector for inverse photoemission spectroscopy is described. The bandpass is effected by the transmission cut-off of a CaF2 window and the ionisation threshold of an acetone filling. The detected mean photon energy is E0=9.9 eV with an energy resolution Delta E=0.4 eV (FWHM). With this detector an inverse photoemission spectrum of silver has been measured; it yields a total energy resolution of the apparatus (electron source and photon detector) of Delta E=0.55 eV (FWHM).