Measurement of Carbon Disulfide Anion Diffusion in a TPC
  A Negative Ion Time Projection Chamber was used to measure the field dependence of lateral and longitudinal diffusion for CS$_2$ anions drifting in mixtures of CS$_2$ and Ar at 40 Torr. Ion drift velocities and limits on the capture distance for electrons as a function of field and gas mixture are also reported. 
Tohru Ohnuki, Daniel P. Snowden-Ifft and C.J. Martoff