H+and D+ions in He: observations of a runaway mobility
- 28 December 1979
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 12 (24) , 4189-4197
- https://doi.org/10.1088/0022-3700/12/24/024
Abstract
The mobilities of H+ and D+ ions in He have been measured over a range of ratios of electric field strength E to helium number density N with a selected-ion flow-drift tube. It is found that, at E/N greater than about 40Td (1 Td=10-17V cm2), the apparent mobilities exhibit an unusual increase with increasing E/N that is attributed to the breakdown of a steady-state drift velocity, i.e. a runaway mobility. Furthermore, the widths of the arrival-time histograms indicate that the same effect is occurring for the diffusion coefficients. These observations support the predictions of this effect by Lin et al. (1979) from their kinetic-theory calculations using an ab initio potential for the H+-He interaction.Keywords
This publication has 21 references indexed in Scilit:
- Transport properties of gaseous ions over a wide energy range. Part IIAtomic Data and Nuclear Data Tables, 1978
- Ion-neutral reaction-rate constants measured in flow reactors through 1977Atomic Data and Nuclear Data Tables, 1978
- The mobility of protons in heliumJournal of Physics B: Atomic and Molecular Physics, 1978
- Reactions of singly and doubly charged argon ions with N2 and O2 in a steady state hollow cathode dischargeThe Journal of Chemical Physics, 1978
- The selected ion flow tube (SIFT); A technique for studying ion-neutral reactionsInternational Journal of Mass Spectrometry and Ion Physics, 1976
- Mobilities of various mass-identified positive and negative ions in helium and argonThe Journal of Chemical Physics, 1976
- Transport properties of gaseous ions over a wide energy rangeAtomic Data and Nuclear Data Tables, 1976
- Long‐ and intermediate‐range interaction in three lowest sigma states of the HeH+ ionInternational Journal of Quantum Chemistry, 1976
- Mobilities of Mass-Identified Atomic Ions in the Noble GasesPhysical Review A, 1973
- The mobility of protons and alpha particles in heliumJournal of Physics B: Atomic and Molecular Physics, 1968