Abstract
Intense emission in the ultraviolet (250–400 nm) from OH (A2 Σ+) and the rare gas-deuteride excimer ArD has been observed from mixtures of H2O vapour or D2 in Ar and excited in microcavity plasma devices. Peak wavelength-integrated intensities are measured for H2O and D2 concentrations of ∼0.16% and 0.5–1%, respectively. Spectral simulations indicate the OH (A2 Σ+, v′=0) rotational temperature to be 440±20 K for 600 Torr Ar/0.3 Torr H2O mixtures excited in a 45 nL microcavity.
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