Measurements of photoelectron extraction efficiency from CsI into mixtures of Ne with CH4, CF4, CO2 and N2

TL;DR

This paper reports experimental measurements of photoelectron extraction efficiency from CsI into various noble gas-molecular gas mixtures, analyzing how different gases and electric fields influence efficiency and backscattering.

Contribution

It provides new experimental data and comparison with models on how molecular gas admixtures affect photoelectron extraction from CsI in noble gas mixtures.

Findings

Molecular gas admixtures significantly reduce backscattering.

Extraction efficiency depends on gas type, concentration, and electric field.

Data improves understanding of photoelectron behavior in gas detectors.

Abstract

Experimental measurements of the extraction efficiency f of the UV-induced photoelectrons emitted from a CsI photocathode into gas mixtures of Ne with CH4, CF4, CO2 and N2 are presented; they are compared with model-simulation results. Backscattering of low- energy photoelectrons emitted into noble gas is significantly reduced by the admixture of molecular gases, with direct impact on the effective quantum efficiency. Data are provided on the dependence of f on the type and concentration of the molecular gas in the mixtures and on the electric field.