TY  - JOUR
AU  - Ibach, Harald
AU  - Tautz, F. Stefan
AU  - Bocquet, François C.
TI  - A novel high-current, high-resolution, low-kinetic-energy electron source for inverse photoemission spectroscopy
JO  - Review of scientific instruments
VL  - 94
IS  - 4
SN  - 0034-6748
CY  - [Erscheinungsort nicht ermittelbar]
PB  - American Institute of Physics
M1  - FZJ-2023-02243
SP  - 043908
PY  - 2023
AB  - A high-current electron source for inverse photoemission spectroscopy is described. The source comprises a thermal cathode electron emission system, an electrostatic deflector-monochromator, and a lens system for variable kinetic energy (1.6–20 eV) at the target. When scaled to the energy resolution, the electron current is an order of magnitude higher than that of previously described electron sources developed in the context of electron energy loss spectroscopy. Surprisingly, the experimentally measured energy resolution turned out to be significantly better than calculated by standard programs, which include the electron–electron repulsion in the continuum approximation. The achieved currents are also significantly higher than predicted. We attribute this “inverse Boersch-effect” to a mechanism of velocity selection in the forward direction by binary electron–electron collisions.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000978948200002
DO  - DOI:10.1063/5.0138512
UR  - https://juser.fz-juelich.de/record/1008197
ER  -