  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.
