The mobility of positive and negative ions in liquid xenon

Schmidt, Werner F.; Hilt, Oliver; Illenberger, Eugen; Khrapak, A. G.

doi:10.1016/j.radphyschem.2005.04.008

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…Among electronegative impurities such as CO 2 [23], NO [24], and SF 6 [25], O 2 [26], whose electron affinity is ≈ 0.45 eV [27], plays the most important role because its ubiquitous presence as impurity even in the best purified gas makes the same ionic species, O − 2 , available to probe sample specific features. The mobility of O − 2 has been investigated only in few experiments: in liquid Ar and Kr [9] and Xe [9,11,28] and in supercritical He [29,30], Ne [30,31], and Ar [32,33]. Here, we report new results obtained in Neon gas on several isotherms in a broad density range and show how the experimental results are very well rationalized by a recent thermodynamical model aimed at predicting the ion hydrodynamic radius [34][35][36][37][38].…”

mentioning

confidence: 61%

A thermodynamic model for ${{\rm{O}}}_{2}^{-}$ mobility in neon gas over broad density and temperature ranges

Borghesani

Aitken

2019

Plasma Sources Sci. Technol.

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We report new measurements of the mobility µ of O − 2 ions in supercritical neon in the range 45 K ≤ T ≤ 334 K for number density N ≥ 0.5 nm −3 . We rationalize the experimental data of all isotherms with the Stokes-Cunningham formula by computing the ion hydrodynamic radius as a function of T and N with the thermodynamic free volume model developed for the ion mobility in superfluid He. The model parameters are determined by re-analyzing published data for T = 45 K for N up to N ≈ 1.65N c (N c ≈ 14.4 nm −3 is the critical number density), which roughly span four orders of magnitude of the Knudsen number (0.1 ≤ K n ≤ 1000), covering the transition from the kinetic-to the hydrodynamic transport regime. These parameters provide an excellent description of the dependence of µ on N for all higher isotherms and yield a strict test of the model validity, thereby bridging the gap between the kinetic-and the hydrodynamic transport regimes.

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mentioning

confidence: 61%

A thermodynamic model for ${{\rm{O}}}_{2}^{-}$ mobility in neon gas over broad density and temperature ranges

Borghesani

Aitken

2019

Plasma Sources Sci. Technol.

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“…We believe that it is reasonable to assume that there is a significant equilibrium concentration of O − 2 built-up. The drift velocity of O − 2 under the default detector conditions is 0.4 cm/s [42]. By Einstein's Relation, the diffusion coefficient of O − 2 is on the order of 10 −5 cm 2 /s.…”

Section: Infrared Light-stimulated Photodetachmentmentioning

confidence: 94%

Correlated single- and few-electron backgrounds milliseconds after interactions in dual-phase liquid xenon time projection chambers

Kopec¹,

Baxter²,

Clark³

et al. 2021

J. Inst.

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We characterize single- and few-electron backgrounds that are observed in dual-phase liquid xenon time projection chambers at timescales greatly exceeding a maximum drift time after an interaction. These instrumental backgrounds limit a detector's sensitivity to dark matter and cosmogenic neutrinos. Using the ∼ 150 g liquid xenon detector at Purdue University, we investigate how these backgrounds, produced after 122 keV 57Co Compton interactions, behave under different detector conditions. We find that the rates of single- and few-electron signals follow power-laws with time after the interaction. We observe linearly increasing rates with increased extraction field. The relationship of the rates in the single-electron background with increased drift field is unclear. Normalizing the rates to the primary interaction's measured ionization signal, the rates increase linearly with the depth of the interaction. We test the hypothesis that infrared photons (1550 nm) would stimulate and accelerate electron emission via photodetachment from impurities, but find that even 1 Watt of infrared light fails to reduce these backgrounds. We thus provide a characterization that can inform background models for low-energy rare event searches.

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“…In addition to neutral species, it is also conceivable that negative ions previously created by electron attachment can be photoionised during their long drift towards the anode, which is as slow as $0.7 cm/s for a O À 2 ions in LXe [28]. However, the concentration of O À 2 accumulated from electron attachment during calibration and background runs seems too low to explain the observed rate.…”

Section: Introductionmentioning

confidence: 98%

Measurement of single electron emission in two-phase xenon

Edwards

Araújo

Chepel

et al. 2008

Astroparticle Physics

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We present the first measurements of the electroluminescence response to the emission of single electrons in a two-phase noble gas detector. Single ionization electrons generated in liquid xenon are detected in a thin gas layer during the 31-day background run of the ZEPLIN-II experiment, a two-phase xenon detector for WIMP dark matter searches. Both the pressure dependence and magnitude of the single-electron response are in agreement with previous measurements of electroluminescence yield in xenon. We discuss different photoionization processes as possible cause for the sample of single electrons studied in this work. This observation may have implications for the design and operation of future large-scale two-phase systems.Comment: 11 pages, 6 figure

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The mobility of positive and negative ions in liquid xenon

Cited by 10 publications

References 23 publications

A thermodynamic model for ${{\rm{O}}}_{2}^{-}$ mobility in neon gas over broad density and temperature ranges

A thermodynamic model for ${{\rm{O}}}_{2}^{-}$ mobility in neon gas over broad density and temperature ranges

Correlated single- and few-electron backgrounds milliseconds after interactions in dual-phase liquid xenon time projection chambers

Measurement of single electron emission in two-phase xenon

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