Experimental ion mobility measurements in pure iC4H10 and Ar-iC4H10 mixtures

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

doi:10.1088/1748-0221/14/04/p04010

Abstract

In this paper we present the results of the ion mobility measurements made in pure isobutane (iC4H10) and in mixtures with argon (Ar-iC4H10) for a total pressure of 8 Torr \ ext{(10.6 mbar)} and for low reduced electric fields in the 10 Td to 45 Td range (2.4–10.8 kV⋅cm−1⋅bar−1), at room temperature. The reduced mobilities, obtained from the peak centroid of the time-of-arrival spectra, are presented for Ar concentrations in the 5%–95% range.

Highlights

Still, when comparing our results for low reduced electric fields with the ones found in literature, we find that our results are in good agreement with the ones obtained by other authors [19, 28] at atmospheric pressure, with a small deviation of less than 2% for C12H+n even though, at our pressures, C12H+n mobility is expected to be affected by its predecessor ion
In the present work we measured the reduced mobility of ions originated by electron impact for electron energies up to 25 eV, in pure iC4H10 and Ar-iC4H10 mixtures for pressures from 6 to 10 Torr, low reduced electric fields from 10 to 45 Td and different mixture ratios
In pure iC4H10, two peaks were observed from 5 Td up to 40 Td, which were attributed to C8H+n and C12H+n

Summary

Introduction

: In this paper we present the results of the ion mobility measurements made in pure isobutane (iC4H10) and in mixtures with argon (Ar-iC4H10) for a total pressure of 8 Torr (10.6 mbar) and for low reduced electric fields in the 10 Td to 45 Td range (2.4–10.8 kV·cm−1·bar−1), at room temperature. Between collisions is below the thermal energy [8, 9] with the mobility reaching a constant value, as vd becomes proportional to E. between collisions is below the thermal energy [8, 9] with the mobility reaching a constant value, as vd becomes proportional to E This is the case in the range of reduced electric fields studied in this work. To suppress the dependence of the mobility values on the gas pressure, K is usually expressed in terms of reduced mobility K0: K0 = K N/N0.

Methods

Results

Conclusion