Interaction potential and transport coefficients for Li<sup>+</sup>ions in helium

Elford, M. T.; Røeggen, I.; Skullerud, H R

doi:10.1088/0953-4075/32/8/308

Cited by 17 publications

(12 citation statements)

References 30 publications

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“…For the X 1 Σ + ground state, the calculated characteristic spectroscopic data were found to be in perfect agreement with the best obtained results available from the literature in the past (Senff & Burton 1986;Elford et al 1999). For the ground state (X-state) and the first excited 1,3 Σ + states (A-and a-states), radiative association processes were investigated in detail (Augustovičová et al 2012;Bovino et al 2011).…”

Section: Nonadiabatic Nuclear Dynamicssupporting

confidence: 83%

Non-radiative inelastic processes in lithium-helium ion-atom collisions

Belyaev

Augustovičová

Soldán

et al. 2014

A&A

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Aims. The aims are to estimate efficiencies of non-radiative inelastic processes in lithium-helium ion-atom collisions and to compare them to those for radiative processes. Methods. Non-radiative inelastic cross-sections and rate coefficients for different lithium-helium ion-atom collisions are estimated by means of the recently proposed branching probability current method, which is based on the accurate ab initio adiabatic BornOppenheimer potentials that have been recently calculated for the low-lying 1,3 Σ + and 1,3 Π states of the LiHe + ion. Results. It is shown that at low temperatures the radiative depopulation in Li + + He and Li + He + collisions dominates over the non-radiative processes, while in Li + + He(2s 3 S) collisions the non-radiative processes dominate over the radiative association at temperatures above 3000 K, which can be expected to have some influence on depopulations of metastable He in high temperature astrophysical environments.

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Section: Nonadiabatic Nuclear Dynamicssupporting

confidence: 83%

Non-radiative inelastic processes in lithium-helium ion-atom collisions

Belyaev

Augustovičová

Soldán

et al. 2014

A&A

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“…[22] were used to calculate the mean free path of Li + . At 627 °C in 2.5 mtorr of helium at 27 °C it is 0.50 cm, somewhat smaller than the mean free path of neutral lithium because of the stronger interaction of Li + and He.…”

Section: Lithium Deposition During He Glow Dischargementioning

confidence: 99%

Mass changes in NSTX surface layers with Li conditioning as measured by quartz microbalances

Skinner

Kugel

Roquemore

et al. 2009

Journal of Nuclear Materials

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Abstract:Dynamic retention, lithium deposition, and the stability of thick deposited layers were measured by three quartz crystal microbalances (QMB) deployed in plasma shadowed areas at the upper and lower divertor and outboard midplane in the National Spherical Torus Experiment (NSTX).Deposition of 185 µg/cm 2 over 3 months in 2007 was measured by a QMB at the lower divertor while a QMB on the upper divertor, that was shadowed from the evaporator, received an order of magnitude less deposition. During helium glow discharge conditioning both neutral gas collisions and the ionization and subsequent drift of Li + interrupted the lithium deposition on the lower divertor. We present calculations of the relevant mean free paths. Occasionally strong variations in the QMB frequency were observed of thick lithium films suggesting relaxation of mechanical stress and/or flaking or peeling of the deposited layers.

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“…But given several different high-level ab initio calculations for Li + -He (for which the ab initio calculations should be most accurate) using different methods (see, for example, Ref. [22]), but which are in very close agreement (see Ref. [6]), it appears that the maximum errors in the R e , x e , and D e values for Li-He + in Tables 1-3 are ±0.002 Å , ±1 cm À1 , and ±5 cm À1 .…”

Section: Ab Initio Calculational Inaccuraciesmentioning

confidence: 99%