Vacuum ultraviolet photon detector with continuously adjustable resolution for inverse photoemission spectroscopy

TL;DR

This paper introduces a VUV photon detector with adjustable energy resolution for inverse photoemission spectroscopy, utilizing specific materials and gases to optimize performance across different temperatures.

Contribution

The authors developed a continuously tunable energy resolution detector for inverse photoemission spectroscopy using a Geiger-Müller type counter with specific window and gas choices.

Findings

Energy resolution tunable from 46meV to 105meV

Detector normalized with deuterium lamp and monochromator

Optimal operation achieved by adjusting gas ratios

Abstract

We present a vacuum ultraviolet (VUV) band-pass photon detector for inverse photoemission spectroscopy. A SrF2 window is used due to its high-energy cutoff of the optical transmission being 9.7eV, and acetone is selected as filling gas with the photoionization threshold also being 9.7eV. The structure of the detector described in detail is based on a Geiger-M\"uller type counter with an MgF2 window and argon as amplification gas. Its energy resolution can be tuned continuously from 46meV with a normal temperature situation to 105meV at 215K. Meanwhile, the signal intensity of the detector is adjusted accordingly to find an optimal operation program for our inverse photoemission system which is being constructed. The ratio of acetone vapor and argon is varied carefully. Background signals and the response of time are analyzed. The detector is normalized by deuterium lamp in combination with a grating monochromator.