Experimental ion mobility measurements in Xe-CH4

J.M.C Perdigoto,C.A.N Conde,A.F.V Cortez,F.P Santos,P.N.B Neves,F.I.G.M Borges,R Veenhof

doi:10.1088/1748-0221/12/09/p09003

Abstract

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.

Highlights

- Experimental ion mobility measurements in Ar-C2H6 mixtures A F V Cortez, A N C Garcia, P N B Neves et al
: In this paper we present the results of the ion mobility measurements made in gaseous mixtures of xenon (Xe) with ethane (C2H6) 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
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 C2H+6 to C2H6 that affects the mobility of its ion products (C3H+8 and C3H+9 )

Summary

Introduction

- Experimental ion mobility measurements in Ar-C2H6 mixtures A F V Cortez, A N C Garcia, P N B Neves et al. : In this paper we present the results of the ion mobility measurements made in gaseous mixtures of xenon (Xe) with ethane (C2H6) 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. 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 C2H+6 to C2H6 that affects the mobility of its ion products (C3H+8 and C3H+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.

Methods

Results

Conclusion