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Our recent studies of electroluminescence (EL) properties in two-phase argondetectors for dark matter searches have revealed the presence of unusualdelayed pulses in the EL signal in the form of two slow components with timeconstants of about 5 and 50 $\mu$s. These components were shown to be presentin the charge signal itself, which clearly indicates that drifting electronsare temporarily trapped on two states of metastable negative argon ions whichhave never been observed before. In this work, using the pressure dependence ofthe ratio of slow component contributions measured in experiment, it is deducedthat these states are those of two types of metastable negative molecular ions,$\mathrm{Ar}_2^{*-}(b \ ^4\Sigma_u^-)$ and $\mathrm{Ar}_2^{*-}(a \^4\Sigma_g^+)$ for the higher and lower energy level respectively.

european physical journal. c, particles and fields

Possible evidence for the production of Ar$_2^{*-}$ metastable negative  molecular ions in gaseous argon of two-phase detectors for dark matter  searches