Electron drift velocities in xenon and xenon-nitrogen gas mixtures

Abstract

The drift velocity of an electron swarm in pure xenon gas (99.995% pure) and xenon gas mixtures, containing 0.1%, 1%, and 10% nitrogen additive, was measured in a pulsed-Townsend drift tube in order to observe the effects of the additives on electron mobility, and to demonstrate negative differential conductivity. The digitized signal was analyzed by a microcomputer to produce swarm drift time measurements. The amount of nitrogen necessary to perturb the electron drift velocity in pure xenon is implied from these measurements.

Electron drift properties in high pressure gaseous xenon

“…As can be seen in figure 17, the results are compatible with previous experimental measurements carried out at different pressures [10][11][12][13][14][15][16][17]20]. This level of agreement shows that pressure scaling of the diffusion parameters can be trusted for these operating pressures, suggesting that the role of dimers and higher order xenon clusters in electron transport is still minor at pressures up to ∼10 bar, at least.…”

Electron drift properties in high pressure gaseous xenon

“…As can be seen in figure 17, the results are compatible with previous experimental measurements carried out at different pressures [10][11][12][13][14][15][16][17]20]. This level of agreement shows that pressure scaling of the diffusion parameters can be trusted for these operating pressures, suggesting that the role of dimers and higher order xenon clusters in electron transport is still minor at pressures up to ∼10 bar, at least.…”

“…Electron transport properties in xenon gas have mostly been measured at low pressures [10][11][12][13][14][15], usually not higher than atmospheric pressure with few exceptions at high pressure [16,17]. In this regard, the NEXT Collaboration previously measured the drift velocity and the longitudinal diffusion at 10 bar in several prototypes [8,18,19].…”

An investigation of thermodynamics, microscopic structure, depolarized Rayleigh scattering, and collision dynamics in Xe-N 2 supercritical mixtures

“…These measurements were later simulated by Roco et al [18] who used quantum theory and a classical free linear rotor. Patrick et al [19] measured electron drift velocities in Xe and Xe-N 2 mixtures. Although the Ar-N 2 van der Waals complex was observed by Herrebout et al [20] using infrared spectroscopy, a similar attempt for the detection of Xe-N 2 at 80-123 K in the liquid phase was not successful.…”