Abstract
In this paper we present the results of the ion mobility measurements made in gaseous mixtures of xenon with carbon tetrafluoride (Xe-CF4) for pressures ranging from 6 to 10 Torr (8-10.6 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 one or two peaks depending on the gas relative abundances, which were attributed to CF3+ and to Xe2+ ions. However, for Xe concentrations above 60%, only one peak remains (Xe2+). The reduced mobilities obtained from the peak centroid of the time-of-arrival spectra are presented for Xe concentrations in the 5%-95% range.
Highlights
: In this paper we present the results of the ion mobility measurements made in gaseous mixtures of xenon with carbon tetrafluoride (Xe-CF4) for pressures ranging from 6 to 10 Torr (8-10.6 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 photoelectrons released from the CsI film are guided through the Gas Electron Multiplier (GEM) holes by the electric field created by applying an adequate voltage across its electrodes
The range of the reduced electric field values used to determine the ions’ mobility is limited by two factors: the occurrence of electric discharges at high E/N and the deterioration of the time-of-arrival spectra for very low E/N values, which has been attributed to collisions between the ions and impurity molecules
Summary
: In this paper we present the results of the ion mobility measurements made in gaseous mixtures of xenon with carbon tetrafluoride (Xe-CF4) for pressures ranging from 6 to 10 Torr (8-10.6 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 one or two peaks depending on the gas relative abundances, which were attributed to CF+3 and to Xe+2 ions. The reduced mobilities obtained from the peak centroid of the time-of-arrival spectra are presented for Xe concentrations in the 5%-95% range. The mobility measurements are usually presented as a function of the reduced electric field E/N in units of Td (1 Td = 10−21 V·m2) and the reduced mobility obtained from equation (1.2) is expressed in terms of cm2·V−1·s−1
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