Rydberg states of the rare gas dimers

Ginter, M. L.; Eden, J. G.

doi:10.1139/v04-089

Cited by 12 publications

(5 citation statements)

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“…59 In a simplified, earlier model, Ar 14 + consists of an ionic Ar 2 + core surrounded by 12 atoms in an approximately icosahedral arrangement. 90 The bond length of Ar 2 + (2.44 Å 91 ) is much smaller than the bond length of neutral Ar 2 (3.82 Å); apparently the dimer ion can be accommodated at the center of the cluster, which has enhanced stability because 12 atoms in the solvation shell optimize the arrangement.…”

Section: Articlementioning

confidence: 99%

Solvation of Silver Ions in Noble Gases He, Ne, Ar, Kr, and Xe

et al. 2019

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We use a novel technique to solvate silver cations in small clusters of noble gases. The technique involves the formation of large, superfluid helium nanodroplets that are subsequently electron ionized, mass-selected by deflection in an electric field, and doped with silver atoms and noble gases (Ng) in pickup cells. Excess helium is then stripped from the doped nanodroplets by multiple collisions with helium gas at room temperature, producing cluster ions that contain no more than a few dozen noble gas atoms and just a few (or no) silver atoms. Under gentle stripping conditions, helium atoms remain attached to the cluster ions, demonstrating their low vibrational temperature. Under harsher stripping conditions, some of the heavier noble gas atoms will be evaporated as well, thus enriching stable clusters of Ng n Ag m + at the expense of less stable ones. This results in local anomalies in the cluster ion abundance, which is measured in a high-resolution time-of-flight mass spectrometer. On the basis of these data, we identify specific "magic" sizes n of particularly stable ions. There is no evidence, however, for enhanced stability of Ng 2 Ag + , in contrast to the high stability of Ng 2 Au + that derives from the covalent nature of the bond for heavy noble gases. "Magic" sizes are also identified for Ag 2 + dimer ions complexed with He or Kr. Structural models will be tentatively proposed. A sequence of magic numbers n = 12, 32, and 44, indicative of three concentric solvation shells of icosahedral symmetry, is observed for He n H 2 O + .

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Section: Articlementioning

confidence: 99%

Solvation of Silver Ions in Noble Gases He, Ne, Ar, Kr, and Xe

et al. 2019

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“…Rare-gas dimers play an important role in chemical and physical processes taking place in the discharges of excimer lasers, in rare-gas ion lasers, and in high-pressure lamps. [1][2][3][4][5][6] Their electronic spectrum is complex: [7][8][9][10][11] Rydberg series converging on all six low-lying electronic states of the singly charged rare-gas dimer cations overlap spectrally and interact. Configurational mixing and spectral perturbations are extensive in the electronically excited states, and many states are predissociative and/or have potential-energy functions with multiple minima.…”

Section: Introductionmentioning

confidence: 99%

Structure and dynamics of the electronically excited C 1 and D 0+ states of ArXe from high-resolution vacuum ultraviolet spectra

Piticco

Schäfer

Merkt

2012

The Journal of Chemical Physics

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Vacuum ultraviolet spectra of the C 1 ← X 0(+) and D 0(+) ← X 0(+) band systems of ArXe have been recorded at high resolution. Analysis of the rotational structure of the spectra of several isotopomers, and in the case of Ar(129)Xe and Ar(131)Xe also of the hyperfine structure, has led to the derivation of a complete set of spectroscopic parameters for the C 1 and D 0(+) states. The rovibrational energy level structure of the C 1 state reveals strong homogeneous perturbations with neighboring Ω = 1 electronic states. The analysis of isotopic shifts led to a reassignment of the vibrational structure of the C 1 state. The observation of electronically excited Xe fragments following excitation to the C state rotational levels of f parity indicates that the C state is predissociated by the electronic state of 0(-) symmetry associated with the Ar((1)S(0)) + Xe(6s(')[1/2](0) (o)) dissociation limit. The observed predissociation dynamics differ both qualitatively and quantitatively from the behavior reported in previous investigations. An adiabatic two-state coupling model has been derived which accounts for the irregularities observed in the rovibronic and hyperfine level structure of the C 1 state. The model predicts the existence of a second state of Ω = 1 symmetry, supporting several tunneling/predissociation resonances located ~200 cm(-1) above the C 1 state.

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“…The dimers are model systems for studying atomatom interactions [3] and represent a starting point to describe the properties of larger rare-gas clusters [4,5]. Several experimental and theoretical studies have been devoted to the ground and first excited singlet states of Ne 2 [6][7][8][9][10] and to its triplet Rydberg states [10][11][12][13][14][15][16][17][18][19][20], which were studied from the metastable a 3 R þ u state. The six low-lying electronic states of the Ne þ 2 ion have been studied by microwave electronic spectroscopy [21,22] and ab initio quantum chemistry [23].…”

Section: Introductionmentioning

confidence: 99%