The Mobility of Li + Ions in Helium and Argon

Cassidy, RA; Elford, M. T.

doi:10.1071/ph850587

Cited by 20 publications

(27 citation statements)

References 3 publications

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“…also agree equally well with the earlier data of Cassidy and Elford [22], except around and above the mobilitypeak region where the latter values are up to l%%uo lower. Curiously, however, the MCS-LSLS results agree almost perfectly with the Cassidy and Elford data throughout the entire range of the latter, although the LSLS potential was derived from the data of Skullerud et al…”

Section: Discussionsupporting

confidence: 91%

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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Section: Discussionsupporting

confidence: 91%

Reexamination of theLi+-He interaction potential

1992

Phys. Rev. A

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“…The second and later check was made with Li+ ions in helium at low values of E/ N, 3 and 10 Td. The measured mobilities agreed with those obtained by Cassidy and Elford (1985) to within 0•1 %.…”

Section: Apparatussupporting

confidence: 84%

“…Because of its theoretical simplicity the most extensively studied case is that of Li + ions in helium, and a large number of calculations of potentials and sets of ion mobility data have been published (see e.g. Cassidy and Elford 1985).…”

Section: Introductionmentioning

confidence: 99%

“…However, to determine the repulsive part of the potential requires data of high accuracy at large E/ N values. Much of the available mobility data for Li + -He at high E/ N values is subject to large statistical scatter while the values of Cassidy and Elford (1985), which have an experimental scatter of only 0•2%, do not extend beyond 70 Td. Moreover their measurements at E/N values between 30 and 70 Td were made at only one gas pressure and drift length and therefore the extent of 'end effects' could not be determined.…”

Section: Introductionmentioning

confidence: 99%

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The Mobility of Li+ Ions in Helium at 294 K and High E / N Values

England¹,

Elford²

1987

Aust. J. Phys.

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The mobility of Li + ions in helium (294 K) has been measured at E/ N values between 40 and 90 Td using the Tyndall-Powell four-gauze method. The drift distances used varied from 35 to 208 mm. Errors due to 'end effects' were taken into account by extrapolation of the mobility data to large distances. The corrected mobility values are estimated to have an uncertainty of less than 1 %. The present values are compared with previous data and shown to agree to within the experimental error with values calculated from the ab initio interaction potential of Senff and Burton (1986).

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“…[18][19][20] The dispersion interaction can also play an important part of binding between metal ions and the rare gases. [25][26][27][28][29][30][31][32][33] The data for most transport experiments are obtained at room temperatures where the small size of Li + -RG dispersion interaction will not have much influence. [22][23][24] Experimental investigations of the transport of the Li + ion in the rare gases have prompted investigations of the interaction potentials between Li + and the rare gases.…”

Section: Introductionmentioning

confidence: 99%

Long-range dispersion coefficients for Li, Li+, and Be+ interacting with the rare gases

Tang

Zhang

Zhou

et al. 2010

The Journal of Chemical Physics

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The long-range dispersion coefficients for the ground and excited states of Li, Li(+), and Be(+) interacting with the He, Ne, Ar, Kr, and Xe atoms in their ground states are determined. The variational Hylleraas method is used to determine the necessary lists of multipole matrix elements for He, Li, Li(+), and Be(+), while pseudo-oscillator strength distributions are used for the heavier rare gases. Some single electron calculations using a semiempirical Hamiltonian are also performed for Li and Be(+) and found to give dispersion coefficients in good agreement with the Hylleraas calculations. Polarizabilities are given for some of the Li and Li(+) states and the recommended (7)Li(+) polarizability including both finite-mass and relativistic effects was 0.192 486 a.u. The impact of finite-mass effects upon the dispersion coefficients has been given for some selected interatomic interactions.

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The Mobility of Li + Ions in Helium and Argon

Cited by 20 publications

References 3 publications

Reexamination of theLi+-He interaction potential

Reexamination of theLi+-He interaction potential

The Mobility of Li+ Ions in Helium at 294 K and High E / N Values

Long-range dispersion coefficients for Li, Li+, and Be+ interacting with the rare gases

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