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Buzulutskov, A.; Frolov, E.; Borisova, E.; Nosov, V.; Oleynikov, V.; Sokolov, A.
The European physical journal. C, Particles and fields, 6/10, Volume: 83, Issue: 10Journal Article
Our recent studies of electroluminescence (EL) properties in two-phase argon detectors for dark matter searches have revealed the presence of unusual delayed pulses in the EL signal in the form of two slow components with time constants of about 5 and 50 μ s . These components were shown to be present in the charge signal itself, which clearly indicates that drifting electrons are temporarily trapped on two states of metastable negative argon ions which have never been observed before. In this work, using the pressure dependence of the ratio of slow component contributions measured in experiment, it is deduced that these states are those of two types of metastable negative molecular ions, Ar 2 ∗ - ( b 4 Σ u - ) and Ar 2 ∗ - ( a 4 Σ g + ) for the higher and lower energy level respectively.
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