Photoelectron extraction efficiency into Ar-CF4 and Xe-CF4 gas mixtures

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Escada, J (Author) Other; Coelho, LCC (Author) FCUP; Dias, THVT (Author) Other; Lopes, JAM (Author) Other; dos Santos, JMF (Author) Other

Journal

Title: Journal of Instrumentation

Vol. 13

ISSN: 1748-0221

Publisher: Institute of Physics Publishing

Indexing

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Other information

Authenticus ID: P-00P-JNF

DOI: 10.1088/1748-0221/13/09/p09001

Abstract (EN): Experimental measurements of the extraction efficiency f of the photoelectrons emitted from a reflective CsI photocathode into Ar-CF4 and Xe-CF4 gaseous mixtures are presented, as a function of reduced electric field E/p in the range 0.1 to 3 V cm(-1) Torr(-1) and as a function of CF4 concentration. The experimental data is compared to Monte Carlo simulation results. The investigation confirms that backdiffusion of low-energy photoelectrons emitted from a photocathode into a gas medium depends strongly on the nature of the gas. The effect is especially significant in pure noble gases, but it can be considerably reduced by the admixture of certain molecular gases, like CF4.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11