Attenuation of vacuum ultraviolet light in pure and xenon-doped liquid argon -An approach to an assignment of the near-infrared emission from the mixture

作者：Neumeier A; Dandl T; Himpsl A; Oberauer L; Potzel W; Schoenert S; Ulrich A^*

来源：EPL, 2015, 111(1): 12001.

DOI：10.1209/0295-5075/111/12001

Results of transmission experiments of vacuum ultraviolet light through a 11.6 cm long cell filled with pure and xenon-doped liquid argon are described. Pure liquid argon shows no attenuation down to the experimental short-wavelength cut-off at 118 nm. Based on a conservative approach, a lower limit of 1.10 m for the attenuation length of its own scintillation light could be derived. Adding xenon to liquid argon at concentrations on the order of parts per million leads to strong xenon-related absorption features which are used for a tentative assignment of the recently found near-infrared emission observed in electron-beam excited liquid argon-xenon mixtures. Two of the three absorption features can be explained by perturbed xenon transitions and the third one by a trapped exciton (Wannier-Mott) impurity state. A calibration curve connecting the equivalent width of the absorption line at 140 nm with xenon concentration is provided.

• 出版日期2015-7