Electron pair emission from surfaces: Some general experimental considerations
Abstract
We discuss some experimental facets of electron pair emission from surfaces using two different experimental approaches. In the first case the instrument consists of a pair of hemispherical analyzers which are operated with continuous primary beams of electrons or photons. The second instrument employs a pair of time-of-flight spectrometers which require a pulsed excitation source. A key experimental quantity is the ratio of `true' to `random' coincidences which can be determined in different ways. Regardless of the type of instrument the primary flux has to adopt a much smaller value than in single electron spectroscopy. We describe different approaches to obtain the relevant count rates, in particular the concept of operating with a delayed coincidence circuit. We also address the question on how to compare the two types of spectrometer in terms of their performance.
Cite
@article{arxiv.2111.09203,
title = {Electron pair emission from surfaces: Some general experimental considerations},
author = {R. Kamrla and W. Widdra and C. -T. Chiang and F. O. Schumann},
journal= {arXiv preprint arXiv:2111.09203},
year = {2022}
}