High Precision Measurements of Carbon Disulfide Negative Ion Mobility and Diffusion

Abstract

High precision measurements were made of reduced mobility, lateral and longitudinal diffusion of CS2- negative ions in 40 Torr CS2 and a 30 - 10 Torr CS2 - CF4 gas mixture. The reduced mobility was found to be 353.0 +/- 0.5 cm^2 Torr / s V in CS2 and 397.4 +/- 0.7 cm^2 Torr / s V in the CS2 - CF4 gas mixture at STP. The lateral diffusion temperatures for these two gases (295 +/- 15 K and 297 +/- 6 K) were found to be in good agreement with room temperature. By contrast longitudinal diffusion temperature was found to be slightly elevated (319 +/- 10 (stat) +/- 8 (sys) K and 310 +/- 20 (stat) +/- 6 (sys) K) though given the errors, room temperature diffusion can not be ruled out. For lateral diffusion significant capture distances (0.21 +/- 0.07 mm and 0.15 +/- 0.03 mm) were measured while for longitudinal diffusion the results were not conclusive.

Published by Review of Scientific Instruments but with some errors. These have been fixed. This version is more accurate than the published version

References in corpus (3)

• Track Reconstruction and Performance of DRIFT Directional Dark Matter Detectors using Alpha Particles
• Measurements of W-value, Mobility and Gas Gain in Electronegative Gaseous CS2 and CS2 Gas Mixtures
• Towards energy resolution at the statistical limit from a negative ion time projection chamber

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