Measurements of D<sub>T</sub>/μ of Na<sup>+</sup>ions in argon and neon

Hogan, M. J.; Ong, P.P.

doi:10.1088/0022-3727/23/8/008

Cited by 22 publications

(10 citation statements)

References 20 publications

(10 reference statements)

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“…This discrepancy is probably caused by a systematic error in the mobility measurements made with the Georgia Tech drift tube-mass spectrometer. 8,10,11 Considering the limits of the standard error for each set of data, there are generally good agreement among the four sets of D T (r) values. Excellent agreement between the experimental D T (r) values and the MCS calculated data in the low E/N region suggests that the KMV potential is a good representation of the actual potential in this region.…”

Section: Discussionmentioning

confidence: 78%

“…[1][2][3][4][5][6][7] However, there is a dearth of experimental data for D T or D T /K of sufficient accuracy. [3][4][5][6][7][8][9][10][11][12][13][14][15] The only experimental data reported for both Rb ϩ -Kr and Rb ϩ -Xe systems are values of the reduced mobility ͑K 0 ͒, 16 and the product of the neutral gas number density and longitudinal diffusion coefficient ͑ND L ͒. 17 These data were compiled in numerical form by Ellis et al 18 To our knowledge, no transverse diffusion data has yet been reported for Rb ϩ ions drifting in Kr and Xe gases.…”

Section: Introductionmentioning

confidence: 99%

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Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

Tan

Ong

1995

The Journal of Chemical Physics

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Monte Carlo simulation studies of diffusion coefficients and mobilities for Rb+-N2 with anisotropic model potential and comparison with experimental measurementsThe ratio of the transverse diffusion coefficient to the mobility (D T /K) for Rb ϩ ions drifting in Kr and Xe gases at about 303 K has been measured at electric field to neutral gas density ratio (E/N) values ranging from 5 to 500 Td. Calculations of the reduced mobility ͑K 0 ͒ and the ratios of the longitudinal and transverse diffusion coefficients to mobility ͑D L /K and D T /K, respectively͒ for both Rb ϩ -Kr and Rb ϩ -Xe systems were made using a Monte Carlo simulation ͑MCS͒ technique and the interaction potential of Koutselos, Mason, and Viehland ͓J. Chem. Phys. 93, 7125 ͑1990͔͒. Furthermore, D L /K and D T /K values were derived from K 0 values obtained from the present MCS calculations and from experimental results reported in the literature, using the generalized Einstein relations which are based on the three-temperature theory. For the Rb ϩ -Kr system, the experimental values of D T /K were found to be 2%-4% higher than those from MCS calculations for E/N values above 120 Td. For the Rb ϩ -Xe system, the experimental D T /K values were similarly higher than the MCS values in the range 90-220 Td. Given that the standard error of the experimental measurements of D T /K is estimated to be better than 3% and that of the MCS calculations is better than 2.5%, the agreement between the present experimental D T /K data and those from MCS calculations can be considered to be fairly good. The interaction potential of Koutselos, Mason, and Viehland therefore appears to represent well the actual potential for both Rb ϩ -Kr and Rb ϩ -Xe systems.

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Section: Discussionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

Tan

Ong

1995

The Journal of Chemical Physics

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“…The variance x 2 , and the D T /K ratio for a given E/N value and drift length z were then derived from an analysis of the transverse ion current profile recorded. The experimental values of D T /K were temperature-corrected to 303 K using a formula given previously [9].…”

Section: The Experimental Methodsmentioning

confidence: 99%

“…Routine checks were duly made of the independence of the data from gas pressure, ion injection conditions and space charge effects. For the present ion-neutral gas pairs, the longitudinal end effects were found to be inevitably present but were effectively corrected for by using the technique reported earlier [10].…”

Section: The Experimental Methodsmentioning

confidence: 99%

Experimental and Monte Carlo simulation studies of transport properties of swarms drifting in Ne and Ar gases

Zhou

Ong

et al. 1996

J. Phys. D: Appl. Phys.

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The ratio of the transverse diffusion coefficient to the mobility, , has been experimentally determined for ions drifting in Ne and Ar gases, in the presence of a uniform electric field. Results at 303 K are reported for electric field-to-neutral gas number density ratio E/N range 5 - 600 Td, with an overall accuracy of %. The results were effectively corrected for longitudinal end effects present in the drift tube. In addition, Monte Carlo simulation (MCS) calculations were performed for the mobility and for transverse and longitudinal diffusion coefficients using respectively the Koutselos, Mason and Viehland (KMV) interaction potential and a modified Tang - Toennies (MTT) interaction potential as input. The accuracy of the MCS calculations is estimated to be within 1% for K, 2% for and 3% for . Comparisons of the MCS results with available experimental data give an indication of the validity and accuracy of the respective assumed interaction potential at different interatomic distances. The calculated results did not reproduce the experimental data very well, suggesting that both potentials should be modified.

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“…Details of the apparatus used to measure Dr/K for K+and Na+-ion swarms in several rare gases have been previously reported [19,20]. Briefly, the method consists of allowing a low-density slit source to introduce ions at one end of a drift tube pressurized with a selected neutral gas.…”

Section: Measurements Of Dt /Kmentioning

confidence: 99%

Reexamination of theLi+-He interaction potential

1992

Phys. Rev. A

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Using various recently proposed interaction potentials for the Li+-He system, elaborate calculations of the mobility, longitudinal, and transverse diffusion coefficients of Li+ swarms in helium have been made by high-speed Monte Carlo simulations (MCS s). In addition, the transverse diffusion coefficients for this ionneutral-atom pair have been experimentally measured with total errors of +3/o. The close agreement of the present experimental results with those of Skullerud, Eide, and Stefansson [J. Phys. D 19, 197 (1986)] as well as the faithful MCS reproduction of all three transport coefficients using the interaction potential proposed by Larsen et al. [J. Phys. B 21, 2519[J. Phys. B 21, (1988] over the entire range of E/N (electric field to neutra1-particle number density ratio) studied not only provides confirmation of their transport coefficient values, but also lends strong support for their proposed interaction potential. In comparison, the more recent potentials of Ahlrichs et a!. [J. Chem. Phys. 88, 6290 {1988)] and of Koutselos, Mason, and Viehland [J. Chem. Phys. 93, 7125 (1990)] did not reproduce the experimental data quite as well. As a benchmark the MCS calculations have also provided evidence of the accuracy of the Kramers-Moyal expansion method in calculating the transport coefficients.PACS number(s): 34.20. Cf, 51.50.+v, 52.25.Fi

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Measurements of D_T/μ of Na⁺ions in argon and neon

Cited by 22 publications

References 20 publications

Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

Experimental and Monte Carlo simulation studies of transport properties of swarms drifting in Ne and Ar gases

Reexamination of theLi+-He interaction potential

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Measurements of DT/μ of Na+ions in argon and neon

Cited by 22 publications

References 20 publications

Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

Experimental and Monte Carlo simulation studies of transport properties of swarms drifting in Ne and Ar gases

Reexamination of theLi+-He interaction potential

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Measurements of D_T/μ of Na⁺ions in argon and neon