Experimental ion mobility measurements in Ne-CF4

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

doi:10.1088/1748-0221/14/04/p04015

Abstract

In this paper we present the results of the ion mobility measurements made in gaseous mixtures of neon with carbon tetrafluoride (Ne-CF4) at a total pressure 8 Torr (10.6 mbar) and for low reduced electric fields in the 10 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, which was attributed to CF3+. The reduced mobilities obtained from the peak centroid of the time-of-arrival spectra are presented for Ne concentrations in the 5%–95% range.

Highlights

: In this paper we present the results of the ion mobility measurements made in gaseous mixtures of neon with carbon tetrafluoride (Ne-CF4) at a total pressure 8 Torr (10.6 mbar) and for low reduced electric fields in the 10 to 25 Td range (2.4–6.1 kV·cm−1·bar−1), at room temperature
The mobility of the ions originated in Ne-CF4 mixtures has been measured for different reduced electric fields E/N, for a total pressure of 8 Torr and at room temperature (293 K)
There are two striking features both of which occur with increasing Ne concentration in the mixture: one is the increase in the mobility of the ions that results in a shift in the peaks towards lower drift times and the other is a decrease in their abundance which can be seen from the decrease in the peak area, more pronounced for Ne concentrations above 70%

Summary

Introduction

: In this paper we present the results of the ion mobility measurements made in gaseous mixtures of neon with carbon tetrafluoride (Ne-CF4) at a total pressure 8 Torr (10.6 mbar) and for low reduced electric fields in the 10 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, which was attributed to CF+3. The reduced mobilities obtained from the peak centroid of the time-of-arrival spectra are presented for Ne concentrations in the 5%–95% range. The reduced mobility predicted by the Langevin theory, which assumes that the neutral polarization is the main responsible for the K0 value at low electric field and low temperature, is given by: Kpol = 13.88

Methods

Results

Conclusion