Photoelectron spectroscopy of II–VI semiconductors under cooperative UV and visible excitation

Publisher Website
Google Scholar
Abstract
A new technique, resonant multiphoton photoelectron spectroscopy, has been used to investigate cleaved samples of ZnTe and CdTe. The simplest application of this technique involves excitation of electrons from the valence band to empty conduction or surface states below the vacuum level and subsequent excitation to states above vacuum by a second photon generally of higher energy. We have detected this and other related processes by measuring spectra of the resultant external photoelectrons. The most striking feature of these spectra is a very sharp primary photoelectron peak corresponding to an intermediate state near the bottom of the conduction band, which has been transiently populated to a density of order 1019 cm−3 by a pulse of 2.33 eV photons. The secondary electron spectrum is also due entirely to multiple photon excitations. Three-photon as well as two-photon excitation processes have been demonstrated.

This publication has 0 references indexed in Scilit: