Abstract. The spectral and temporal light emission properties of liquid argon have been studied in the context of its use in large liquid rare-gas detectors for detecting Dark Matter particles in astronomy. A table-top setup has been developed. Continuous and pulsed low energy electron beam excitation is used to stimulate light emission. A spectral range from 110 to 1000 nm in wavelength is covered by the detection system with a time resolution on the order of 1 ns.

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A simple table-top windowless system for extreme ultraviolet (XUV) spectroscopy which avoids differential pumping for both the radiation source and the detector is presented. The radiation source uses excimer emission from rare gases excited with low energy (13 keV) electron beam. Broadband emission in the entire wavelength range from 60 to 140 nm is demonstrated using He, Ne and a Ne-Ar gas mixture. It was observed that the so-called third continuum is absent in Ne when low energy electron-beam excitation is used in contrast to earlier results using high energy ion beam excitation. An application of the set-up for a LiF transmission measurement close to the cut-off wavelength (105 nm) is demonstrated. It is shown how the radiation source could be applied in a simple and efficient technique of material treatment with XUV/VUV radiation.

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