The mobilities of xenon ions in xenon and the derived charge transfer cross section for Xe+(2P3/2) ions in xenon

Larsen, P H; Elford, M. T.

doi:10.1088/0022-3700/19/4/012

Cited by 26 publications

(21 citation statements)

References 20 publications

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“…The additional ionisation available in the present source provided increased current and thus higher accuracy at low E/N values. The source has a triode-type electrode structure to provide enhanced ionisation at low gas densities (see Larsen and Elford 1986), although in the present work, where the gas densities were always relatively large, it was not possible to take advantage of this feature. Electrons were extracted from within the cylindrical grid and transported to the first shutter grid Gl by appropriate electric fields.…”

Section: (C) Electron Sourcementioning

confidence: 92%

Momentum Transfer Cross Section for Electrons in Mercury Vapour Derived from Drift Velocity Measurements in Mercury Vapour?Gas Mixtures

England¹,

Elford²

1991

Aust. J. Phys.

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The Bradbury-Nielsen time-of-flight method has been used to measure electron drift velocities at 573 K in pure mercury vapour, a mixture of 46·80% helium-53· 20% mercury vapour and a mixture of 9·37% nitrogen-90· 63% mercury vapour. The E/N and pressure ranges used were O· 2 to 1· 5 Td and 5·4 to 15·2 kPa for pure mercury vapour, 0 ·08 to 3·0 Td and 5 ·40 to 26·88kPa for the mixture containing helium and 0·06 to 5·0Td and 3·33 to 16·67kPa for the mixture containing nitrogen. It is shown that the use of mixtures significantly reduces the dependence of the measured drift velocity on the pressure, due to the effect of mercury dimers, from that measured in pure mercury vapour. An iterative procedure to derive the momentum transfer cross section for electrons in mercury vapour over the range 0·04 to 4 eV with an uncertainty between ±5 and 10% is described. It is concluded that previously published momentum transfer cross sections for mercury vapour derived from drift velocity data are significantly in error, due to diffusion effects and the procedure used to correct for the influence of dimers. The present cross section is in good agreement with the semi-empirical calculations of Walker (personal communication).

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Section: (C) Electron Sourcementioning

confidence: 92%

Momentum Transfer Cross Section for Electrons in Mercury Vapour Derived from Drift Velocity Measurements in Mercury Vapour?Gas Mixtures

England¹,

Elford²

1991

Aust. J. Phys.

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“…Resonant CX collisions will lead to a complete loss of the energy of the ion, which is taken over by the neutral of the same species. The cross section of CX may be accurately represented, for a wide range of energies, by an expression of the form [18][19][20][21][22]:…”

Section: Description Of the Modelmentioning

confidence: 99%

Capacitively coupled plasma source operating in Xe/Ar mixtures

Babaeva¹,

Lee²,

Shon³

2005

J. Phys. D: Appl. Phys.

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The parameters of a capacitively coupled plasma source operating in Xe/Ar mixtures have been studied using particle-in-cell/Monte Carlo methods. The plasma density, ion energy distributions (IEDs) for different sorts of ions, ion current densities, energy delivered by ions to the electrodes and other parameters of a Xe/Ar plasma are systematically investigated as a function of the Xe/(Ar + Xe) mixing ratio. It is shown that the addition of xenon to an argon discharge increases the plasma density, changes the electron energy distribution and lowers the electron temperature. Both single and dual frequency plasma issues are addressed. The dependence of the IED on the observation position in the sheath is also investigated. Computational results are compared with available experimental data.

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“…However, the results of these calculations are found to coincide with results without increased re-ignition voltages. If a different noble gas is chosen, the new gas constants A, B and y will change the function Vcgtow versus jlp' according to equation 10. Only in the case of long currentless periods does the calculated ignition time increase slightly.…”

Section: Calculated and Measured Resultsmentioning

confidence: 99%

Glow-to-arc transitions in gas discharge lamps

Luijks

Vliet

1988

Lighting Research & Technology

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The Waymouth model, which describes the glow-to-thermionic arc transition in qualitative terms, has been extended. To get a quantitative description of the glow-to-arc transition phenomena in metal halide lamps (with their emitterless electrodes) it is essential to include in the model a current dependent glow voltage. When this is done, the model calculations of the glow time and ignition time are found to agree well with experimental results. The influences of a number of lamp parameters on glow time and ignition time have been investigated in the light of this improved model.

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The mobilities of xenon ions in xenon and the derived charge transfer cross section for Xe⁺(²P_3/2) ions in xenon

Cited by 26 publications

References 20 publications

Momentum Transfer Cross Section for Electrons in Mercury Vapour Derived from Drift Velocity Measurements in Mercury Vapour?Gas Mixtures

Momentum Transfer Cross Section for Electrons in Mercury Vapour Derived from Drift Velocity Measurements in Mercury Vapour?Gas Mixtures

Capacitively coupled plasma source operating in Xe/Ar mixtures

Glow-to-arc transitions in gas discharge lamps

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