Measurements of transport coefficients for lithium ions in argon and helium ions in helium with a drift-tube mass spectrometer

A drift-tube mass spectrometer for precision measurements of transport coefficients for ions in gases is described. The apparatus has been used to determine the ratio DT/ mu between the transverse diffusion coefficient and the mobility for He+ ions in the helium at 294 K and 15<or=E/n0<or=2000 Td, by direct measurement of transverse current density distributions of mass-analysed ions. The apparatus has also been used to determine the drift velocity Vdr and the ratio DL/ mu between the longitudinal diffusion coefficient and the mobility for Li+ ions in argon at 295 K and 40<or=E/n0<or=400 Td and the ratio DT/ mu for Li+ ions in argon at 294 K and 15<or=E/n0<or=550Td, using the Townsend method. Good agreement was found between the present experimental results and recent calculations from at initio potentials.

[1]  D. Linhjell,et al.  Drift and longitudinal diffusion of lithium ions in helium , 1987 .

[2]  L. Viehland,et al.  Transport properties for systems with resonant charge transfer , 1986 .

[3]  H. Skullerud,et al.  Transverse Diffusion of Lithium Ions in Helium , 1986 .

[4]  M. Elford.  The heat of dissociation of H5+ derived from measurements of ion mobilities , 1983 .

[5]  L. Viehland.  Interaction potentials for Li+—rare-gas systems , 1983 .

[6]  T. Märk,et al.  The transverse diffusion of mass-identified N + 2 ions in nitrogen , 1983 .

[7]  E. A. Mason,et al.  Influence of resonant charge transfer on ion diffusion and generalized Einstein relations. , 1982 .

[8]  Y. Satoh,et al.  Mobilities and longitudinal diffusion coefficients for Li + ions in Ar, Kr, and Xe at room temperature , 1982 .

[9]  S. Sinha,et al.  The mobility of He+ ions in He , 1979 .

[10]  J. Rees,et al.  Transport properties of mass-identified ions in oxygen, nitrogen, carbon dioxide and carbon monoxide , 1979 .

[11]  T. Koizumi,et al.  Mobilities of Various Ions in Non-Parent Gases; Compilation of the Mobility Data Measured with the Injected-Ion Drift Tube Mass Spectrometer in Tokyo Metropolitan University. , 1978 .

[12]  H. Helm.  The cross section for symmetric charge exchange of He+ in He at energies between 0.3 and 8 eV , 1977 .

[13]  N. Takata.  Mobilities and clustering of Li+, Na+ and K+ ions in Ar gas , 1977 .

[14]  E. W. McDaniel,et al.  Longitudinal diffusion coefficients of Li+ and Na+ ions in He, Ne, and Ar: Experimental test of the generalized Einstein relation , 1975 .

[15]  E. W. McDaniel,et al.  Mobilities of Li+ ions in He, Ne, and Ar and of Na+ ions in He, Ne, Ar, and CO2 , 1975 .

[16]  D. Albritton,et al.  Flow‐drift technique for ion mobility and ion‐molecule reaction rate constant measurements. I. Apparatus and mobility measurements , 1973 .

[17]  M. Elford,et al.  Precision Measurements of the Townsend Energy Ratio for Electron Swarms in Highly Uniform Electric Fields , 1965 .

[18]  R. Oppermann.  The mobility of positive ions in gases , 1939 .

[19]  E. J. Jones,et al.  Filament Sources of Positive Ions , 1936 .