ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 40, Number 12
JKCSEZ 40(12)
December 20, 1996 

An inverse photoemission spectrometer has been built and tested to study the unoccupied electron energy states of solid surfaces. It consists of a low energy electron gun and a band pass photon detector in an ultra-high vacuum chamber. The electron ray tracing simulation and current measurement of the electron gun show a good focus and a high flux of electron current. The overall resolution of the spectrometer is 0.74 eV and the sensitivity of the photon detector is about 10 counts/sec·μA. As a test experiment, the inverse photoemission spectra of a Ge(111) sample is in good agreement with the theoretical result.