PRODUCT

PSP Vacuum

INVERSE PHOTOEMISSION IPES

IPES

DESCRIPTION

Inverse Photoemission
Model IPES

Electron source, photon detector and data system for Inverse Photoemission
Spectroscopy. A surface science technique to probe the unoccupied electronic
states above the Fermi level, a complementary technique to photoemission
LUMO (lowest unoccupied molecular orbital) measurements in organic
semiconductors

IPES is used to study the empty electronic states of solids. The sample is
bombarded with a beam of electrons with well defined energy and light is
emitted when electrons make direct transitions into the unoccupied states.
PSP manufacture an IPES electron gun and control unit, IPES photon
detector with power supply and pre-amplifier / discriminator and also supply
a data system. The photons are detected as a function of the kinetic energy
of the incident electron beam. The data system ramps the beam energy
using a DAC and recovers the CEM pulses to obtain an IPES spectrum.