A novel high-current, high-resolution, low-kinetic-energy electron source for inverse photoemission spectroscopy

[Abstract] A high-current electron source for inverse photoemission spectroscopy (IPES) is described. The source comprises a thermal cathode electron emission system, an electrostatic deflectormonochromator, 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.

https://opac.ll.chiba-u.jp/da/curator/900121666/

https://opac.ll.chiba-u.jp/da/curator/900121666/RSI22-AR-02626.pdf

AIP Publishing

Journal Article

Review of Scientific Instruments

94

4

043908

2023-04-26

https://doi.org/10.1063/5.0138512

eng

https://doi.org/10.1063/5.0138512

author

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Review of Scientific Instruments 94, 043908 (2023) and may be found at https://doi.org/10.1063/5.0138512 .