In this paper we present the results of the ion mobility measurements made in pure carbon tetrafluoride (CF4) and gaseous mixtures of argon with carbon tetrafluoride (Ar-CF4) 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 only one peak throughout the entire range studied which was attributed to CF3+. However, for Ar concentrations above 70%, a bump starts to appear at the left side of the main peak for reduced electric fields higher than 15 Td, which was attributed to impurities. The reduced mobilities obtained from the peak centroid of the time-of-arrival spectra are presented for Ar concentrations in the 5%–95% range.
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-CO 2 mixtures are presented. The results for this mixture show the presence of only one peak for all gas ratios of Xe-CO 2 , low reduced electric fields, E/N, 10-25 Td (2.4-6.1 kV•cm −1 •bar −1 ), low pressures 6-8 Torr (8-10.6 mbar), at room temperature.
K: Gaseous detectors; Ionization and excitation processes; Charge transport and multiplication in gas; Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS))1Corresponding author.
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