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Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
First Observation of Neutral Bremsstrahlung Electroluminescence in Liquid Argon
A Bondar1, A Buzulutskov1, E Frolov1
1Budker Institute of Nuclear Physics SB RAS, Lavrentiev avenue 11, 630090 Novosibirsk, Russia and Novosibirsk State University, Pirogova street 2, 630090 Novosibirsk, Russia.
Abstract:
A recent discovery of additional mechanism of electroluminescence (EL) in noble gases due to the neutral bremsstrahlung (NBrS) effect led to a prediction that NBrS EL should be present in noble liquids as well. A theoretical model of NBrS EL in noble liquids was developed accordingly in the frameworks of Cohen-Lekner and Atrazhev. In this work, we confirm this prediction: For the first time, visible-range EL has been observed in liquid argon at electric fields reaching 90 kV/cm, using gas electron multiplier (GEM) and thick GEM structures. Absolute light yields of the EL were measured and found to be in excellent agreement with the theory, provided that the momentum-transfer cross section of electron scattering is used for calculation of the NBrS cross section (instead of the energy-transfer one).
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