In this paper we present the results of the ion mobility measurements made in gaseous mixtures of xenon (Xe) with ethane (C 2 H 6 ) for pressures ranging from 6 to 10 Torr (8-10.6 mbar) and for low reduced electric fields in the 10 Td to 25 Td range (2.4-6.1 kV•cm −1 • bar −1 ), at room temperature. The time of arrival spectra revealed two peaks throughout the entire range studied which were attributed to ion species with 3-carbons (C 3 H + 5 , C 3 H + 6 C 3 H + 8 and C 3 H + 9 ) and with 4-carbons (C 4 H + 7 , C 4 H + 9 and C 4 H + 10 ). Besides these, and for Xe concentrations above 70%, a bump starts to appear at the right side of the main peak for reduced electric fields higher than 20 Td, which was attributed to the resonant charge transfer of C 2 H + 6 to C 2 H 6 that affects the mobility of its ion products (C 3 H + 8 and C 3 H + 9 ). The time of arrival spectra for Xe concentrations of 20%, 50%, 70% and 90% are presented, together with the reduced mobilities as a function of the Xe concentration calculated from the peaks observed for the low reduced electric fields and pressures studied. K: Charge transport and multiplication in gas; Ionization and excitation processes; Gaseous detectors; Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS))1Corresponding author.

Data on ion mobility is important to improve the performance of large volume gaseous detectors. In the present work, the method, experimental setup and results for the ion mobility measurements in Xe-CH4 mixtures are presented. The results for this mixture show the presence of two distinct groups of ions. The nature of the ions depend on the mixture ratio since they are originated by both Xe and CH4. The results here presented were obtained for low reduced electric fields, E/N, 10–25 Td (2.4–6.1 kV ⋅ cm−1 ⋅ bar−1), at low pressure (8 Torr) (10.6 mbar), and at room temperature.

Data on ion mobility is important to improve the performance of large volume gaseous detectors, since the detector signal can be influenced by the drift of the ions, namely in the cases where charge multiplication is used, for example in Multi-Wire Proportional Chambers (MWPCs) and in some Time Projection Chambers (TPCs). In the present work the results for the ion mobility measurements in Ar-N 2 mixtures are presented, using an experimental setup and method already tested in previous work. The results for this mixture show the presence of only one peak for all gas ratios of Ar-N 2 , for reduced electric fields, E/N, in the range of 10-25 Td (2.4-6.1 kV•cm −1 •bar −1 ), and 8 Torr (10.6 mbar) pressure, at room temperature. K: Charge transport and multiplication in gas; Gaseous detectors; Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS)); Ionization and excitation processes 1Corresponding author.