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  • 1
    Electronic Resource
    Electronic Resource
    Comment on "The potential energy function for O2 X(3Σ−g) and the transition dipole moment of the Schumann–Runge band near X state dissociation'' (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7532-7533 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459384
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  • 2
    Electronic Resource
    Electronic Resource
    A photoionization study of SeH and H2Se (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 4815-4824 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoion yield curve of SeH, prepared by the reaction H+H2Se is presented. The adiabatic I.P. is 9.845±0.003 eV, and autoionization structure is observed, from which higher I.P.'s are inferred. The photoion yield curves of H2Se+, SeH+, and Se+ from H2Se are also measured. The fragmentation thresholds, together with I.P. (SeH), enable one to infer the bond energies D0(HSe−H)=78.99±0.18 kcal/mol and D0(SeH)=74.27±0.23 kcal/mol. The adiabatic I.P. for H2Se (X˜ 2B) is 9.886±0.003 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451715
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  • 3
    Electronic Resource
    Electronic Resource
    Rotational features in the fluorescence excitation spectrum of O(1D2) from vacuum ultraviolet laser photodissociation of O2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 1060-1068 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Seventh-order anti-Stokes Raman-shifted ultraviolet laser radiation is used to dissociate O2 in the 175–177 nm region of the Schumann–Runge band system, B 3Σ−u–X 3Σ−g. A cross section for the production of O(1D2) is deduced from the 762 nm fluorescence of O2(b 1Σ+g), a collisional de-excitation product of O(1D2) and O2(X 3Σ−g). Step structure observed in the spectrum is attributed to rotational thresholds for absorption from X 3Σ−g to energies above the B 3Σ−u dissociation limit. The threshold energies define a limiting rotationless dissociation energy of 57 136.4±0.9 cm−1. Shape resonances, quasibound by the rotational barrier of B 3Σ−u, are observed for the first time in O2. A theoretical calculation of the cross section is in agreement with the measured cross section when the near-dissociation outer limb of the B 3Σ−u potential has an R−5 long range form. The shape of the adopted potential is consistent with an avoided crossing with another 3Σ−u state near R=4.6 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460062
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of the 3pπue′ 3Δu Rydberg state of O2 by (3+1) resonance-enhanced multiphoton-ionization spectroscopy (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 8364-8371 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The diffuse v=0 to 4 levels of the 3pπu e′ 3Δu Rydberg state of O2 are identified and characterized using (3+1) resonance-enhanced multiphoton-ionization spectroscopy. An experimental potential-energy curve for the e′ state, together with the magnitude of its interaction with the A′ 3Δu valence state, are determined semiempirically by analyzing the predissociated spectra using the coupled-channel Schrödinger-equation method. The experimental Rydberg-valence coupling (930 cm−1) exceeds significantly the value calculated ab initio by Buenker and Peyerimhoff [Chem. Phys. Lett. 34, 225 (1975)] (〈320 cm−1), but is in good agreement with the single-configuration model prediction of Lewis et al. [J. Chem. Phys. 113, 2214 (2000)] (900 cm−1). © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1367333
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  • 5
    Electronic Resource
    Electronic Resource
    Relations between Rydberg-valence interactions in the O2 molecule (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 2214-2223 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a single-configuration formulation, analytical expressions are derived for the (X 2Πg) nsσg, npπu, and npσu Rydberg-valence interaction matrix elements in O2. In addition, new results from diabatic, coupled-channel deperturbations of experimental data dependent on these interactions are reported for n=3 and 4. Using these results, the large differences in magnitude between the Rydberg-valence couplings for the constituent states of the npπu Rydberg complex that are predicted by the analytical expressions are verified experimentally. Effective values for several two-electron integrals are obtained semiempirically through comparison between analytical expressions and deperturbed experimental values for the Rydberg-state energies and Rydberg-valence couplings, allowing predictions to be made for the spectroscopy of the npπu 1Σu− Rydberg states which have yet to be observed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.482035
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  • 6
    Electronic Resource
    Electronic Resource
    New magnetic dipole transition of the oxygen molecule: B′ 3Πg←X 3Σg−(0,0) (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 5503-5508 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Through the use of isotopically pure gas at a temperature of 77 K, a weak photoabsorption band of 16O2 is found near 1856 Å, underlying the stronger Schumann–Runge (SR) band B 3Σu−←X 3Σg−(8,0). The location, structure, and intensity of this new band are consistent with expectation for the magnetic dipole transition B′ 3Πg←X 3Σg−(0,0), where the designation B′ is chosen to represent the II 3Πg valence state. This electronic transition contributes to the "excess absorption" underlying the SR bands [B. R. Lewis, S. T. Gibson, and E. H. Roberts, J. Chem. Phys. 115, 245 (2001)]. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456506
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  • 7
    Electronic Resource
    Electronic Resource
    λ and γ reversal: The dissociation-limit region of the B 3Σu− state of O2 (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 5836-5842 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using narrow-bandwidth vacuum-ultraviolet radiation generated by difference-frequency four-wave mixing in Xe, the O2 photoabsorption cross section in the Schumann–Runge system B 3Σu−←X 3Σg−, near the dissociation limit of the B state, is measured with a resolution of ∼0.1 cm−1 full-width at half-maximum. The rotational structure of B−X(22,0) is assigned for the first time, and evidence is found for transitions into the F1 levels of B(v=23). Experimental values for the triplet-splitting constants λ and γ for B(v=22) are found to be inconsistent with the rising trend observed for v≤19, due to a change in the sense of the perturbation of the B-state levels by the C′ 3Πu levels near B(v=20). A new value for the dissociation energy of the B state, D(B)=57 136.2±0.3 cm−1, determined from an analysis of the observed and missing lines near the dissociation limit, is in excellent agreement with previous values arising from the observation of rotational thresholds in the Schumann–Runge continuum. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1400781
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous isotopic predissociation in the F 3Πu(v=1) state of O2 (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 3286-3296 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a tunable, narrow-bandwidth vacuum-ultraviolet source based on third-harmonic generation from excimer-pumped dye-laser radiation, the F 3Πu←X 3Σg−(1,0) photoabsorption cross sections of 16O2 and 18O2 have been recorded in high resolution. Rotational analyses have been performed and the resultant F(v=1) term values fitted to the 3Π Hamiltonian of Brown and Merer [J. Mol. Spectrosc. 74, 488 (1979)]. A large rotationless isotope effect is observed in the F(v=1) predissociation, wherein the Lorentzian linewidth component for 18O2 is a factor of ∼50 smaller than the corresponding 16O2 linewidth. This effect, a consequence of the nonadiabatic rotationless predissociation mechanism, is described using a coupled-channel treatment of the strongly Rydberg-valence-mixed 3Πu states. Significant J, e/f-parity, and sublevel dependencies observed in the isotopic F(v=1) rotational widths are found to derive from an indirect predissociation mechanism involving an accidental degeneracy with the E 3Σu−(v=3) level, itself strongly predissociated by 3Σu− Rydberg-valence interactions, together with L-uncoupling (rotational) interactions between the Rydberg components of the F and E states. Transitions into the E(v=3) level are observed directly for the first time, specifically in the 18O2 spectrum. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1436106
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  • 9
    Electronic Resource
    Electronic Resource
    Assignment of the excess absorption underlying the Schumann–Runge bands of molecular oxygen (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 245-248 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A long-standing problem, pertaining to the origin of the excess absorption found experimentally to underlie the high-vibrational Schumann–Runge bands of molecular oxygen, is resolved. Through new calculations, with parameter sets based on recently obtained experimental information, it is shown that the excess absorption arises from transitions into the lowest valence states of 3Πu and 3Πg symmetry. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379335
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  • 10
    Electronic Resource
    Electronic Resource
    Asymmetric line shapes in the indirect predissociation of the f 1Σu+ Rydberg state of O2 (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 6631-6640 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotationally-resolved Beutler–Fano line shapes observed in the photoabsorption spectrum of the (2,0) band of the 3pπuf 1Σu+←X 3Σg− Rydberg system of O2 are interpreted using a coupled-channel Schrödinger equations model. It is found that the f 1Σu+ state is indirectly predissociated by the B 3Σu− continuum, and that the f←X transition borrows oscillator strength primarily from dipole-allowed transitions into the mixed Rydberg-valence states of 3Σu− symmetry. Both the predissociation linewidth and oscillator strength of the (2,0) resonance are controlled by the spin-orbit interaction between the 1Σu+ and 3Σu− components of the 3p-complex. There is some evidence for a destructive quantum interference between the transition amplitude borrowed from the 3pπuE 3Σu−←X 3Σg− transition and that borrowed weakly from the f 1Σu+←b 1Σg+ transition through spin-orbit mixing between the b 1Σg+ and X 3Σg− states. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469379
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