Triplet lifetime in gaseous argon

Akashi-Ronquest, M.; Bacon, Amanda; Benson, Christopher; Bhattacharya, Kolahal; Caldwell, T. S.; Formaggio, J. A.; Gastler, D.; Grado-White, Brianna; Griego, J.R.; Gold, M.; Hime, A.; Jackson, C. M.; Jaditz, S.; Kachulis, C.; Kearns, E.; Klein, J.; Ledesma, Antonio; Linden, S.; Lopez, F. E.; MacMullin, S.; Mastbaum, A.; Monroe, J.; Nikkel, J.; Oertel, J. A.; Gann, G. D. Orebi; Ortega, G. S.; Palladino, K. J.; Rielage, K.; Seibert, Stanley; Wang, Jui-Jen

doi:10.1140/epja/i2019-12867-2

Cited by 9 publications

(9 citation statements)

References 29 publications

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“…This purity was estimated through the decay time constant τ t e2 of the triplet excimer states Ar * 2 ( 3 Σ u ). The values obtained between 2.6 and 2.8 μs set the level of impurities in the range 0.1-1 ppm [39], which is consistent with the gas contamination certified by the producer. The light yield via the triplet deexcitation is then scaled by τ t e2 /τ re f , where τ t e2 is the measured triplet decay time and τ re f = 3.2 μs is the triplet radiative lifetime with negligible impurities concentration [40].…”

Section: Methodssupporting

confidence: 85%

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

et al. 2021

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We performed a time-resolved spectroscopic study of the VUV/UV scintillation of gaseous argon as a function of pressure and electric field, by means of a wavelength sensitive detector operated with different radioactive sources. Our work conveys new evidence of distinctive features of the argon light which are in 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 time-resolved analysis of the photon emission reveal that the dominant component of the argon scintillation during the first tens of ns is in the range [160, 325] nm. This light is consistent with the third continuum emission from highly charged argon ions/molecules. This component of the scintillation is field-independent up to 25 V/cm/bar and shows a very mild dependence with pressure in the range [1, 16] bar. The dynamics of the second continuum emission is dominated by the excimer formation time, whose variation as a function of pressure has been measured. Additionally, the time and pressure-dependent features of electron-ion recombination, in the second continuum band, have been measured. This study opens new paths toward a novel particle identification technique based on the spectral information of the noble-elements scintillation light.

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Section: Methodssupporting

confidence: 85%

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

et al. 2021

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“…where τ s is the slow component, τ d is the energy transfer time between the Xe and triplet state of the Ar, A 1 , A 2 and A 3 are the intensities, and τ long is an additional time constant to account for the exponential tail at late times. This artifact is consistent with light coming from the cold gas in the ullage [36].…”

Section: Xenon Dopingsupporting

confidence: 82%

Large-Scale, Precision Xenon Doping of Liquid Argon

McFadden,

Elliott,

Gold

et al. 2020

Preprint

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The detection of scintillation light from liquid argon is an experimental technique key to a number of current and future nuclear/particle physics experiments, such as neutrino physics, neutrinoless double beta decay and dark matter searches. Although the idea of adding small quantities of xenon (doping) to enhance the light yield has attracted considerable interest, this technique has never been demonstrated at the necessary scale. Here we report on xenon doping in a 100 l crogenic vessel. We observed an increase in light yield by a factor of 1.81±0.04 at a dopant concentration of 10 ppm, consistent with a Geant4 prediction of 1.83±0.02. We determine a lower limit on the attenuation length of 3 m at a concentration of 10 ppm.

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“…In our experiment the actual purity of the argon gas was estimated through the decay time constant of the triplet excimer states Ar * 2 ( 3 Σ u ). The values obtained between 2.5 and 3 µs set the level of impurities in the range 0.1-1 ppm [34], which is consistent with the gas contamination certified by the producer. The measured triplet decay time rejects the possible explanation of the UV3-photon production in terms of parasitic re-emissions from N 2 , H 2 O and O 2 contamination, which can only produce a sub-dominant component in the UV band and over a wide time scale.…”

Section: Methodssupporting

confidence: 85%

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

Santorelli,

Garcia,

Abia

et al. 2020

Preprint

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We performed a time-resolved spectroscopic study of the VUV/UV argon scintillation as a function of pressure and electric field, by means of a wavelength sensitive detector operated with different radioactive sources. Our work conveys new evidence of distinctive features of the argon light which are in 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 photon emission reveal that the dominant component of the argon scintillation during first tens of ns is in the range [160, 325] nm. This light is consistent with the third continuum emission from highly charged argon ions/molecules. This component of the scintillation is field-independent up to 25 V/cm/bar and shows a very mild dependence with pressure in the range [1,16] bar. The dynamics of the second continuum emission is dominated by the excimer formation time, whose variation as a function of the pressure has been measured. Additionally, the time and pressure-dependent features of electron-ion recombination, in the second continuum band, have been measured. This study opens new paths toward a novel particle identification technique based on the spectral information of the noble-elements scintillation light.

show abstract

Triplet lifetime in gaseous argon

Cited by 9 publications

References 29 publications

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

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

Large-Scale, Precision Xenon Doping of Liquid Argon

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

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