The mobilities of Rb+ ions in Kr and Xe gases have been measured at 300'K in a drift tube mass spectrometer over a wide range of the ionic energy parameter E / N (the ratio of the electric field intensity to the neutral gas number density). The Viehland-Mason kinetic theory of ionic mobility (valid for arbitrary E / N) is used to derive theoretical mobilities from the electron gas-Drude model potentials of Gordon and Waldman for Rb+ -Ar (mobilities measured previously), Rb+ -Kr, and Rb+ -Xe. The results are compared with the experimental data. Further, by using an iterative technique, new potentials are developed which are determined directly by the experimental data, and these "experimental" potentials are tabulated and compared with the Gordon-Waldman potentials. mobilities in cm 2 /V sec).
Mobilities for K+ ions in Ar, Kr, and Xe gases have been measured at 300 °K in a drift tube spectrometer over a wide range of E/N (the ratio of the electric field intensity to the neutral gas number density). New data for K+–Kr and K+–Xe are presented here. The Viehland–Mason kinetic theory of ionic mobility, being valid for arbitrary E/N, is employed to calculate theoretical mobilities by utilizing electron gas–Drude model potentials of Gordon and Waldman for K+–Ar, K+–Kr, and K+–Xe. The results of these calculations are compared with the experimental data. Using the Gordon and Waldman potentials as a starting point, an iterative scheme, employing the experimental data directly, is used to develop ’’experimental’’ potentials. The new potentials are tabulated and compared to the Gordon and Waldman potentials.
Interaction potentials for Br(2 P)+Ar, Kr, and Xe (1 S) by the crossed molecular beams method Mobilities ofBr-ions in Ar, Kr, and Xe gases at 300 K have been measured in a drift tube mass spectrometer over a wide range of E/N (the ratio of the electric field to the neutral gas number density). For any ion-neutral gas interaction potential, implementation of the Viehland-Mason kinetic theory (accurate for arbitrary E/N) yields theoretical mobility data. This theory is employed in conjunction with an iterativeinversion scheme which uses experimental mobility data to modify an initial "guess" 4,6,12 potential to produce a "directly determined" potential which accurately reproduces the experimental mobilities for a given ion-neutral atom pair. These potentials are tabulated for Be -Ar, Br--Kr, and Br--Xe and their salient features are compared to previous "directly derived" potentials of other ions in these gases.
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