Intense infrared scintillation of liquid Ar-Xe mixtures

Author： Neumeier A. Dandl T. Heindl T. Himpsl A. Hagn H. Hofmann M. Oberauer L. Potzel W. Roth S. Schönert S. Wieser J. Ulrich A.

Publisher： Edp Sciences

E-ISSN： 1286-4854|106|3|32001-32001

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.106, Iss.3, 2014-05, pp. : 32001-32001

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Abstract

Intense infrared (IR) light emission from liquid Ar-Xe mixtures has been observed using 12 keV electron-beam excitation. The emission peaks at a wavelength of $1.18\ \mu \text{m}$ and the half-width of the emission band is $0.1\ \mu \text{m}$ . Maximum intensity has been found for a 10 ppm xenon admixture in liquid argon. The conversion efficiency of electron-beam power to IR light is about 1% (10000 photons per MeV electron energy deposited). A possible application of this intense IR emission for a new particle discrimination concept in liquid noble gas detectors is discussed. No light emission was found for perfectly purified liquid argon in the wavelength range from 0.5 to $3.5\ \mu \text{m}$ on the current level of sensitivity.