Measurements of W-value, Mobility and Gas Gain in Electronegative   Gaseous CS2 and CS2 Gas Mixtures
  W-value, mobility and gas gain measurements have been carried out in electronegative gaseous CS2 and CS2 gas mixtures at a pressure of 40 Torr making use of a single electron proportional counter method. The experimental results have revealed that W-values obtained for CS2 (40 Torr), CS2-CF4 (30 Torr - 10 Torr), CS2-Ar (35 Torr - 5 Torr), CS2-Ne (35 Torr - 5 Torr) and CS2-He (35 Torr - 5 Torr) gas mixtures are 21.1+/-2.7(stat)+/-3(syst) eV, 16.4+/-1.8(stat)+/-2(syst) eV, 13.1+/-1.5(stat)+/-2(syst) eV, 16.3+/-3.0(stat)+/-3(syst) eV and 17.3+/-3.0(stat)+/-3(syst) eV. The mobility for all CS2 gas mixtures was found to be slightly greater and the gas gain was found to be significantly greater relative to pure CS2. 
Kirill Pushkin and Daniel Snowden-Ifft