Mobilities and interaction potentials for Rb+–Ar, Rb+–Kr, and Rb+–Xe

Abstract

The mobilities of Rb+ ions in Kr and Xe gases have been measured at 300'K in a drift tube mass spectrometer over a wide range of the ionic energy parameter E / N (the ratio of the electric field intensity to the neutral gas number density). The Viehland-Mason kinetic theory of ionic mobility (valid for arbitrary E / N) is used to derive theoretical mobilities from the electron gas-Drude model potentials of Gordon and Waldman for Rb+ -Ar (mobilities measured previously), Rb+ -Kr, and Rb+ -Xe. The results are compared with the experimental data. Further, by using an iterative technique, new potentials are developed which are determined directly by the experimental data, and these "experimental" potentials are tabulated and compared with the Gordon-Waldman potentials. mobilities in cm 2 /V sec).

Cationic Noncovalent Interactions: Energetics and Periodic Trends

“…Table lists BDEs for interaction between various metal cations and the rare gases (Rg). Most of these data were acquired using mobility − ,− or scattering ,− techniques. Among these data, Takebe has reported well depths for most of the alkali cation–rare gas interactions, but in many cases, these values are considerably higher than those obtained from alternate sources.…”

“…Multiple references refer to the average from all listed references. E = single temperature equilibrium, H = high-pressure temperature-dependent equilibrium, M = mobility, − ,− P = photodissociation and ionization, , S = scattering, ,, and T = threshold of endothermic reaction. − b Average of values from multiple experiments listed in ref . c Corresponds to an excited electronic state of Ni + . d Relative free energy ( E ) anchored to D (Fe + –CH 4 ) from ref and adjusted to 0 K in ref . …”

“…Multiple references refer to the average from all listed references. E = single temperature equilibrium, H = high-pressure temperature-dependent equilibrium, M = mobility, − ,− P = photodissociation and ionization, , S = scattering, ,, and T = threshold of endothermic reaction. − …”

Spectroscopy of M+·Rg and transport coefficients of M+in Rg (M = Rb–Fr; Rg = He–Rn)

“…There is also no data for any of the Fr 1 Á Rg species, nor for any M 1 Á Rn species. The studies for Rb 1 Á He, [12][13][14][15][16] Rb 1 Á Ne, [12][13][14][15]17 Rb 1 Á Ar, [13][14][15]17,18 Rb 1 Á Kr 13,15,[17][18][19] and Rb 1 Á Xe 15,[18][19][20] and the studies for Cs 1 Á He, 15,21,22 Cs 1 Á Ne, 15,21,23 Cs 1 Á Ar, 15,[23][24][25] Cs 1 Á Kr 15,[24][25][26] and Cs 1 Á Xe, 15,[24][25][26] will be statistically compared to values obtained from our potentials and from the KMV potentials.…”