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  • 1
    Electronic Resource
    Electronic Resource
    Spectra of the rare gas hydrides. IV. Three new bands of argon deuteride involving a low-lying "p'' Rydberg state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7093-7110 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Three fairly strong emission bands of ArD at 6100, 6900, and 10 200 cm−1 have been studied at high resolution. They show very different structures: the first exhibits only Q-form branches, the second P, R, O, and S-form branches, and the third Q, S, and O-form branches. The rotational analysis of each of these bands is not trivial, mainly because the upper state of the first which proved to be also the lower state of the second and third is strongly affected by l uncoupling [i.e., transition to Hund's case (d)] and as a result the usual method of combination differences cannot be applied in their analysis. However, more sophisticated combination differences have been found between the three bands which lead to unambiguous assignments of rotational quantum numbers and thus to rotational constants. It was found that the upper state of the 6100 cm−1 band can be most conveniently represented as a p(2Σ,2Π) complex. This assumption, together with the theoretical selection rules for such a case, led to a full understanding of the structure of the three bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463535
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  • 2
    Electronic Resource
    Electronic Resource
    High orbital angular momentum states in H2 and D2. III. Singlet–triplet splittings, energy levels, and ionization potentials (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 2289-2298 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 5g–4 f Rydberg groups of H2 and D2 first studied in paper I have been obtained with a tenfold increase in resolution which made it possible to resolve the singlet from the triplet components. As a result we can now establish separately precise values for the energy levels in the triplet and singlet systems. For this purpose we have remeasured a number of transitions between the lower energy levels for which at present only old measurements are available. In particular we obtain accurate values for the energies of the lowest (stable) triplet state a3Σ+g relative to the singlet ground state, as well as of the ionization potential. The values obtained for the former are more accurate than obtained from singlet–triplet anticrossings while the latter are of similar accuracy as those reported recently by McCormack et al. [Phys. Rev. A 39, 2260 (1989)] and fit well within this accuracy with the most recent ab initio values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459008
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  • 3
    Electronic Resource
    Electronic Resource
    High orbital angular momentum states in H2 and D2. II. The 6h–5g and 6g–5f transitions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3926-3933 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A group of lines accompanying the first line of the Pfund series of the H atom has been observed by Fourier transform infrared spectrometry. The lines are due to transitions in molecular hydrogen of a nonpenetrating Rydberg electron possessing a high-orbital angular momentum, which is coupled only loosely to the vibrations and rotations of the H+2 core. Lines belonging to the 6h–5g and 6g–5f (v=0–3) transitions of H2 have been identified. The identifications are based on a calculation of the spectrum from first principles by multichannel quantum defect theory. The interaction between the nonpenetrating electron and the core was evaluated in terms of the permanent and induced molecular moments of H+2 as calculated by Bishop and collaborators. The analogous transitions in D2 have also been observed and assigned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456824
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  • 4
    Electronic Resource
    Electronic Resource
    New Rydberg–Rydberg transitions of the ArH and ArD molecules. I. Emission from np states of ArD (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 8245-8257 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ground electronic state of argon hydride has a repulsive potential apart from a long-range van der Waals minimum, but the Rydberg excited states have bound potentials similar to those of the ion ArH+. These states can be described approximately in terms of united-atom quantum numbers nl. We report here rotational analyses of the bands 5p→5s, 5p→6s, and 6p→5s of ArD, which help to further characterize the np Rydberg series. In ArH the bands 5p→5s and 6p→5s have broad lines because of predissociation in the lower state, and 5p→6s is difficult to analyze without further information. The present data are fitted with a Hund's case (d) effective Hamiltonian. In previous work the 4p state was found to have a very small σ-π splitting, but this does not hold for the higher np states, and is probably due to an accidental cancellation between electrostatic and polarizability contributions. On the other hand, the spin–orbit coupling decreases monotonically with n. Features of the rotational levels are discussed in terms of the high-J limiting quantum numbers lJ=N−R and sJ=J−N, where R≡N+, in particular the effect of spin–orbit coupling on the levels with (lJ,sJ)=(−1,1/2) and (0,−1/2), which produces a tendency to Hund's case e behavior in 4p, and a sharp avoided crossing in 6p. The corresponding avoided crossing in 5p would occur beyond the present range of observed J values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471578
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  • 5
    Electronic Resource
    Electronic Resource
    Spectra of rare gas hydrides. VI. The 4f complex and the electronic structure of KrD (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 8874-8885 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The complete rotational analysis of the 4f(2Φ,2Δ,2Π,2Σ+)→4d 2Δ (6600 cm−1), 4f(2Φ,2Δ,2Π,2Σ+)→4d 2Π (8500 cm−1), and 4d 2Δ→5p 2Π (7100 cm−1) Rydberg electronic transitions of KrD is reported. The two newly observed states, the doublet 4f complex and 4d 2Δ together with the np(2Π,2Σ+), nd 2Σ+, ns 2Σ+, and nd 2Π studied earlier by Dabrowski et al., [Mol. Phys. 63, 269 (1988)], and by Dabrowski and Sadovskií [Mol. Phys. 81, 291 (1994)], form a set of states which permits the whole Rydberg electronic structure of the molecule to be determined from the experimental data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475179
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  • 6
    Electronic Resource
    Electronic Resource
    The ionization potential of D"2
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 153 (1992), S. 11-16 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2852(92)90452-T
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  • 7
    Electronic Resource
    Electronic Resource
    The spectrum of HeAr^+
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 89 (1981), S. 491-510 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2852(81)90042-4
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  • 8
    Electronic Resource
    Electronic Resource
    The spectrum of HeNe^+
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 73 (1978), S. 183-214 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2852(78)90215-1
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