The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform
W. Domcke - One of the best experts on this subject based on the ideXlab platform.
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Vibronic coupling in the pE Rydberg Series of NH3
Chemical Physics Letters, 1993Co-Authors: A. Staib, W. DomckeAbstract:Abstract The Jahn—Teller effect in the pE″ Rydberg Series on NH 3 is investigated within a simple multi-channel-quantum-defect-type model. The parameters of the model are determined from recently observed infrared-optical double resonance spectra of the B 1 E″ (3p x,y band system. Jahn—Teller induced vibrational autoionization effects and pronounced perturbations of high Rydberg members are analyzed. a
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Jahn-Teller coupling in Rydberg Series of benzene
The Journal of Chemical Physics, 1991Co-Authors: A. Staib, W. DomckeAbstract:Jahn–Teller coupling effects in doubly degenerate Rydberg Series (npx,y and ndxz,yz, respectively) converging towards the doubly degenerate X2E1g ion core of benzene are analyzed in a multichannel quantum‐defect description. The model includes Jahn–Teller coupling (via the lowest‐frequency E2g mode ν6 ) in the ion core and in the Rydberg orbitals, as well as the interaction of degenerate electronic channels. Fast internal‐conversion processes in the Rydberg manifold of benzene are included in a phenomenological manner via an absorptive imaginary part of the reactance matrix. The model parameters are determined from the analysis of existing multiphoton absorption spectra of low Rydberg members. Absorption spectra of the complete npx,y and ndxz,yz Series and near‐threshold photoionization cross sections are calculated, including hot‐band spectra (one quantum of ν6 excited in the initial electronic state). The results are of relevance for the assignment of the enigmatic vibronic structure of the 3p1A2u and ...
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Vibronic coupling in Rydberg Series of linear molecules
Chemical Physics, 1991Co-Authors: A. Staib, W. Domcke, A. L. SobolewskiAbstract:Abstract Vibronic coupling of Σ and Π Rydberg Series in linear polyatomic molecules is analyzed within a simple multi-channel quantum-defect-type model. The static (potential-energy surfaces of Rydberg states) and dynamic (absorption and photoionization cross sections) aspects of the model are analyzed. The model describes non-Born-Oppenheimer vibronic effects in low Rydberg members, resonant inter-Rydberg perturbations in the range of intermediate principal quantum numbers, as well as vibronically induced autoionization of high Rydberg levels in a coherent manner.
A. Staib - One of the best experts on this subject based on the ideXlab platform.
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Vibronic coupling in the pE Rydberg Series of NH3
Chemical Physics Letters, 1993Co-Authors: A. Staib, W. DomckeAbstract:Abstract The Jahn—Teller effect in the pE″ Rydberg Series on NH 3 is investigated within a simple multi-channel-quantum-defect-type model. The parameters of the model are determined from recently observed infrared-optical double resonance spectra of the B 1 E″ (3p x,y band system. Jahn—Teller induced vibrational autoionization effects and pronounced perturbations of high Rydberg members are analyzed. a
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Jahn-Teller coupling in Rydberg Series of benzene
The Journal of Chemical Physics, 1991Co-Authors: A. Staib, W. DomckeAbstract:Jahn–Teller coupling effects in doubly degenerate Rydberg Series (npx,y and ndxz,yz, respectively) converging towards the doubly degenerate X2E1g ion core of benzene are analyzed in a multichannel quantum‐defect description. The model includes Jahn–Teller coupling (via the lowest‐frequency E2g mode ν6 ) in the ion core and in the Rydberg orbitals, as well as the interaction of degenerate electronic channels. Fast internal‐conversion processes in the Rydberg manifold of benzene are included in a phenomenological manner via an absorptive imaginary part of the reactance matrix. The model parameters are determined from the analysis of existing multiphoton absorption spectra of low Rydberg members. Absorption spectra of the complete npx,y and ndxz,yz Series and near‐threshold photoionization cross sections are calculated, including hot‐band spectra (one quantum of ν6 excited in the initial electronic state). The results are of relevance for the assignment of the enigmatic vibronic structure of the 3p1A2u and ...
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Vibronic coupling in Rydberg Series of linear molecules
Chemical Physics, 1991Co-Authors: A. Staib, W. Domcke, A. L. SobolewskiAbstract:Abstract Vibronic coupling of Σ and Π Rydberg Series in linear polyatomic molecules is analyzed within a simple multi-channel quantum-defect-type model. The static (potential-energy surfaces of Rydberg states) and dynamic (absorption and photoionization cross sections) aspects of the model are analyzed. The model describes non-Born-Oppenheimer vibronic effects in low Rydberg members, resonant inter-Rydberg perturbations in the range of intermediate principal quantum numbers, as well as vibronically induced autoionization of high Rydberg levels in a coherent manner.
J E Hansen - One of the best experts on this subject based on the ideXlab platform.
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autoionization of triply excited Rydberg Series
Physical Review Letters, 2000Co-Authors: Gilles Verbockhaven, J E HansenAbstract:The Auger rates of triply excited Rydberg Series are shown to behave rather differently from doubly excited Series. It is shown that in hollow atoms the Auger decay rates for Rydberg Series of the type 2l2l(')nl(") with n>/=2 are expected to be nearly independent of n, while for doubly excited Series of the type 2lnl(') the decay rate in general decreases with increasing n. In addition the ratio between the rates for 2l2l(')nl(") Rydberg Series with different l(") values will be fixed and often the ratio will be equal to one.
Lars Bojer Madsen - One of the best experts on this subject based on the ideXlab platform.
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Triply excited Rydberg Series and their doubly excited limits in hollow lithium
Journal of Physics B: Atomic Molecular and Optical Physics, 2001Co-Authors: Lars Bojer MadsenAbstract:Rydberg Series in triply excited hollow lithium behave very differently, with respect to autoionization, from Series in the doubly excited ionic system. As opposed to doubly excited states, triply excited Rydberg levels will always start to overlap as the Series limit is approached. It is possible to predict the autoionization width of a triply excited Rydberg state from the doubly excited ionic Series limit. The predictions are illustrated for the 2s2p(3Po)nl(4Po) Series in hollow lithium.
B.n. Jagatap - One of the best experts on this subject based on the ideXlab platform.
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Vibronic and Rydberg Series assignments in the vacuum ultraviolet absorption spectrum of nitrous oxide
Journal of Quantitative Spectroscopy and Radiative Transfer, 2014Co-Authors: Aparna Shastri, Param Jeet Singh, Sunanda Krishnakumar, Anuvab Mandal, B. N. Raja Sekhar, R. D’souza, B.n. JagatapAbstract:Abstract We report a comprehensive photoabsorption study of nitrous oxide (N2O) in the vacuum ultraviolet (45,000–95,000 cm−1) region using synchrotron radiation. The observed spectrum comprises of a few valence transitions and low lying Rydberg Series converging to the two spin–orbit components (2П1/2,3/2) of the ground state of N2O+. Spectral analysis is aided by extensive quantum chemical calculations of vertical excited states, oscillator strengths and potential energy curves using the time dependent density functional theory. Vibronic bands observed in the first absorption system (45,000–60,000 cm−1) are assigned to hot band progressions in υ 2 ′ originating from v″=1 or 2. New insights into the assignment of the well-formed progression of bands in the X1Σ+→C1П system (60,000–72,000 cm−1) are afforded by consideration of the Renner–Teller interaction. A set of molecular vibrational parameters (ω2=467 cm−1, x22=−2.9, e=−0.24) for the C1П state are derived from a fitting of the experimental data. The 3pπ1Σ+ state at ~77,600 cm−1 shows a large quantum defect (0.96) which is explained as arising due to mixed valence–Rydberg character. In the 85,000–95,000 cm−1 region, a number of absorption features are observed with greater clarity than in earlier photoabsorption studies and assigned to Rydberg Series of type nlλ (n=3,4; l=s,p,d; λ=σ,π,δ) and accompanying vibronic bands. This work has resulted in clarification of several discrepancies in earlier Rydberg Series assignments. Additionally, the 3pπ 3Σ− Rydberg state at 85,788 cm−1, the valence transition 7σ→3π (1П) at 87,433 cm−1 and the 3dλ Rydberg Series in the 91,700–92,600 cm−1 region are assigned for the first time.
