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

England, JP; Elford, M. T.

doi:10.1071/ph870355

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…It is clear that r, = 0 in such cases does not mean there is an ultra-short-relaxation region but that the asymptotic characteristics of the long-time regime of s, ' dr)(f') dt' cross the origin of the time axis. In contrast with electrons, ions lose considerable energy Equation ( 44) is the exact theoretical representation of the correction term, being the sum of a geometric series proposed by England and Elford (1987) and derived in a similar way by Standish (1987). A natural extension of the present work will be to give a numerical solution of the initial-value problem of the Boltzmann equation in its matrix form and to present the short-time development of the spacetime moments of the number density of swarms.…”

Section: Calculation Results and Discussionmentioning

confidence: 99%

Short-time and -distance relaxation of swarms in gases

Kondo

Tagashira

1993

J. Phys. D: Appl. Phys.

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The establishment of the hydrodynamic regime is analysed, introducing equations with time-dependent as well as space-dependent transport coefficients and deriving the relations between the two sets of coefficients. Based upon the Fourier transformation technique, the short-time behaviour of swarms in idealized free space is investigated, starting from the Boltzmann equation by means of analysis of its eigenvalue problem. The relaxation times of time-dependent transport coefficients for the establishment of the hydrodynamic regime and the corresponding relaxation distances of space-dependent coefficients, which are defined from the position dependence of the arrival-time spectra and its time moments, have been formulated. By using the theoretical results, which were rewritten in matrix form using the Burnett basis function, the relaxation times of ionization growth, drift and diffusion have been calculated for electrons in krypton gas as functions of the reduced electric field and the mean energy of the initial Gaussian velocity distribution. The relaxation distances d0 in the measurement of the Townsend first ionization coefficient in krypton have been calculated.

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Section: Calculation Results and Discussionmentioning

confidence: 99%

Short-time and -distance relaxation of swarms in gases

Kondo

Tagashira

1993

J. Phys. D: Appl. Phys.

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“…The estimated total error was below +0.5% in the range 3-40Td, while the data above 40 Td may have been systematically wrong due to approximations in the analysis. England and Elford (1987) measured the mobility, at 294 K and 40 s E / n o s 90 Td, using a double-shutter drift tube with variable length. Care was taken to extrapolate the data to 'infinite drift length values', and the error in the extrapolated mobility values was estimated to be below i 1 YO.…”

Section: Experimental Transport Coeficientsmentioning

confidence: 99%

Transport coefficients and interaction potentials for lithium ions in helium and argon

Larsen¹,

Skullerud²,

Lovaas³

et al. 1988

J. Phys. B: At. Mol. Opt. Phys.

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A new approach to the calculation of ion swarm parameters has been developed, based upon a Kramers-Moyal expansion of the Boltzmann collision integral, and has made it possible to avoid the convergence problems associated with the so-called two-and three-temperature theories. The new approach has been used, together with new experimental data, to investigate the 'Li+-He and 'Li+-Ar systems. For the 'Li+-He system, excellent agreement is found between the experimental data and data calculated from a recent ab inirio potential. For the 'Li+-Ar system, a similarly good agreement is found when the best available ab initio potential is modified in a direction indicated by theoretical considerations.

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“…Considerably more accurate mobility values, including liquid nitrogen temperature data, were measured in Canberra by Cassidy and Elford (1985), and at higher E/N values by England and Elford (1987). In Trondheim room-temperature transverse diffusion data were measured by Skullerud et al (1986), and mobility and longitudinal diffusion data by Løvaas et al (1987).…”

Section: Introductionmentioning

confidence: 99%

Interaction potential and transport coefficients for Li⁺ions in helium

Elford¹,

Røeggen²,

Skullerud³

1999

J. Phys. B: At. Mol. Opt. Phys.

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An extended group function model has been applied to determine the interatomic potential for the X state of HeLi+, to an accuracy superior to previously determined potentials. The potential has been used to calculate transport coefficients for Li+ ions in He at 77.5 and 295 K, and new precision measurements of the mobility as a function of E/N have been performed at these temperatures. The agreement between the theoretical and experimental mobility values is excellent, and well within the experimental scatter.

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

Cited by 7 publications

References 3 publications

Short-time and -distance relaxation of swarms in gases

Short-time and -distance relaxation of swarms in gases

Transport coefficients and interaction potentials for lithium ions in helium and argon

Interaction potential and transport coefficients for Li⁺ions in helium

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

Cited by 7 publications

References 3 publications

Short-time and -distance relaxation of swarms in gases

Short-time and -distance relaxation of swarms in gases

Transport coefficients and interaction potentials for lithium ions in helium and argon

Interaction potential and transport coefficients for Li+ions in helium

Contact Info

Product

Resources

About

Interaction potential and transport coefficients for Li⁺ions in helium