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We performed a time-resolved spectroscopic study of the VUV/UV argonscintillation as a function of pressure and electric field, by means of awavelength sensitive detector operated with different radioactive sources. Ourwork conveys new evidence of distinctive features of the argon light which arein contrast with the general assumption that, for particle detection purposes,the scintillation can be considered to be largely monochromatic at 128 nm(second continuum). The wavelength and the time-resolved analysis of the photonemission reveal that the dominant component of the argon scintillation duringfirst tens of ns is in the range [160, 325] nm. This light is consistent withthe third continuum emission from highly charged argon ions/molecules. Thiscomponent of the scintillation is field-independent up to 25 V/cm/bar and showsa very mild dependence with pressure in the range [1,16] bar. The dynamics ofthe second continuum emission is dominated by the excimer formation time, whosevariation as a function of the pressure has been measured. Additionally, thetime and pressure-dependent features of electron-ion recombination, in thesecond continuum band, have been measured. This study opens new paths toward anovel particle identification technique based on the spectral information ofthe noble-elements scintillation light.

Spectroscopic analysis of the argon scintillation with a wavelength sensitive particle detector