Measurements of electron drift velocity in isobutane using the pulsed townsend technique

In the present work we report on the preliminary results related to the dependence of the electron drift velocity for isobutane as function of the reduced electric field E/N in the range of 190 Td up to 211 Td. The employed method is based on the Pulsed Townsend technique. In our configuration the anode is of a high resistivity (2.1010???.m) glass, while the cathode is made of aluminum. In order to validate the technique, the initial measurements were carried out for nitrogen, which is a gas widely studied.