A new experimental technique for measuring the mobilities of positive ions in their parent gases is presented. The technique was applied to the rare gases, Ar, Kr, and Xe, and, for pressures typically below 10 Torr, two different types of positive ions were observed. The reduced mobilities of these ions in their parent gases were measured as a function of E/N, the ratio of the electric field strength to the gas number density, at a temperature of 300±1 K. The results were compared with others available in the literature and the two ions were identified as being the atomic and the dimer rare gas ions. The results are in good agreement with those from other authors. Space charge and impurities effects are discussed.
In this paper we present the experimental results for the mobility of ions in argoncarbon dioxide gaseous mixtures (Ar-CO 2 ) for pressures ranging from 6 to 10 Torr and for reduced electric fields in the 10 Td to 25 Td range, at room temperature.The time-of-arrival spectra of the several mixture ratios studied revealed that the relative abundance of the ions and their mobilities depend on the mixture ratio. For Ar concentrations below 80% only one peak was observed in the spectra which was attributed to CO + 2 , while for Ar concentrations above 80% a second peak appears at the left side of the main peak, which may be due to impurities, probably H 2 O + . In this work, the time-of-arrival spectra from which reduced mobilities were obtained for Ar concentrations of 20% (K 0 = 1.141 ± 0.004 cm 2 V −1 s −1 ), 50% (K 0 = 1.385 ± 0.009 cm 2 V −1 s −1 ), 85% (K 0 = 1.690 ± 0.022 cm 2 V −1 s −1 ) and 95% (K 0 = 1.954 ± 0.043 cm 2 V −1 s −1 ) are displayed as well as other reduced mobilities values obtained similarly. The ion mobility study was performed at reduced electric field values typically used in gaseous detectors.
We measured the reduced mobility of the nitrogen, N + 4 , ion in N 2 , under different pressures and reduced electric fields at 298 K using a new technique. Extrapolation to zero field yields a value of 2.37 cm 2 V −1 s −1 , which is in good agreement with other published data.
A recent experimental technique was used for measuring the mobility of positive ions originated from ethane in their parent gas.In this particular experiment, measurements were made in pure ethane (C 2 H 6 ) for pressures ranging from 6 to 10 Torr and for reduced electric fields varying from 6 to 42 Td. The time of arrival spectra revealed two peaks and their reduced mobilities were determined. Extrapolation to zero field led to the values of 1.58 cm 2 V −1 s −1 and 1.47 cm 2 V −1 s −1 , which are likely to belong to a 3-carbon ions group which includes C 3 H + 5 , C 3 H + 7 , C 3 H + 8 and C 3 H + 9 and to a 4-carbon ions group which includes C 4 H + 9 and C 4 H + 10 ions. For typical reduced electric fields used in gaseous detectors (E/N > 15 Td), the mobilities were 15% smaller than the Langevin limit [1].
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