Repulsive potentials for Na+–R and Al+–R (R= rare gas atoms) derived from beam experiments

Abstract

Repulsive potentials for Na+–R and Al+–R (R=rare gas atoms) are derived from integral scattering experiments using the projectile ions in the energy range 0.5–4 keV. The potentials are well represented by an exponential formula, V (R) =A exp(−αR). The numerical values of the parameters, A (eV) and α (Å−1), are Na+–He, 1200, 4.92; Na+–Ne, 5350, 5.12; Na+–Ar, 11 340, 4.68; Na+–Kr, 9600, 4.33; Al+–He, 325, 3.50; Al+–Ne, 1220, 3.93; and Al+–Ar, 3170, 3.86. The statistical computation published by Kim and Gordon [J. Chem. Phys. 60, 4323 (1974)] for Na+–R is in good agreement with the experiments, and the values for Al+–He and Al+–Ar computed by a similar statistical method are also in good agreement with the experimental results, while Al+–Ne resulted in a significant discrepancy.

Excitation mechanisms in moderate-energyNa+-Ar collisions

“…One-electron transition is assumed here to take place through outer crossing C1 and inner crossing Cz, and two-electron transition through inner and Vz =11240exp( -4. 85R ) -(11.391R ) exp( -13.30R ) -(20.044R ) exp( -21.0R )+10.6 eV, (19) respectively.…”

“…The charge-transfer DCS measured at lower energies for Li+-Ar shows a typical oscillatory gy dependences of the charge-transfer DCS o(8)z& that are calculated by assuming the potentials of Eqs. (18) and (19) and without the interference effect. The calculations adequately explain the drastic energy dependence observed in the experimental DCS around the threshold angle~= 7 keV deg.…”

Spectroscopy of Na+⋅Rg and transport coefficients of Na+ in Rg(Rg=He–Rn)

“…7,8 Waldman and Gordon 9 have reported the results of the most recent ͑modified͒ electron gas modeling, although an earlier study by Gianturco had been published. 10 Powers and Cross 11 have reported the results of ion beam scattering studies, as have Gislason 12 and Kita et al 13 Viehland 4,14 derived potential parameters from ion scattering and transport data, and subsequently Koutselos et al 5 developed a universal scaling scheme that provided good agreement with experiment for all alkali metal/rare gas systems ͑excepting species involving Fr and Rn͒. Nyland et al 15 considered the interaction potentials of Na ϩ…”

Theoretical study of the 3p-excitation in Mg+ and Mg0-inert gas collisions

“…In extending these potentials towards smaller distances we suppose as in [1] that the repulsive part of the potentials is governed by the interaction between the two closed shells of Mg § § and the inert ._x gas atom. We assume furthermore that this repulsion is equal to that between Na § and the respective inert gas atom, and have taken the repulsive part of these potentials from [14,15]. We have also assumed that the relation between the potentials for Mg ~ and Kr is the same as that between Na § -Ar and Kr.…”

“…A detailed description of the method together with the relevant formulas may be found in [1]. [14], and for Mg~ on the calculations of [5]. In extending these potentials towards smaller distances we suppose as in [1] that the repulsive part of the potentials is governed by the interaction between the two closed shells of Mg § § and the inert ._x gas atom.…”