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  • 1
    Electronic Resource
    Electronic Resource
    Interatomic potentials of HgKr and HgXe van der Waals complexes in the A 30+ and B 31 states. Revisited (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7526-7527 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459382
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  • 2
    Electronic Resource
    Electronic Resource
    Interatomic potentials of the C 11 state of HgNe, HgAr, HgKr, and HgXe as studied by tunable vacuum ultraviolet laser spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4646-4653 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The laser induced fluorescence spectra of the C–X transitions of HgRg (Rg=Ne, Ar, Kr, and Xe) van der Waals complexes formed in a supersonic jet have been observed in the longer wavelength side of the Hg(1P1−1S0) resonance transition by use of a tunable vacuum ultraviolet laser, which is generated by the two-photon resonant four-wave sum mixing in Sr vapor. On the basis of vibrational quantum numbers assigned to the upper levels of the observed C–X transitions,potential parameters of the C state are determined. The interatomic potentials for the C state are well approximated by a Morse function and the dissociation energies for HgNe, HgAr, HgKr, and HgXe are 89, 486, 1410, and 3463 cm−1 , respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455684
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  • 3
    Electronic Resource
    Electronic Resource
    Vibrational level structure of highly excited SO2 in the electronic ground state as studied by stimulated emission pumping spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4664-4670 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The stimulated emission pumping (SEP) spectroscopy is applied to SO2 cooled rotationally in a supersonic free jet to investigate the vibrational and rotational level structure in the 17 300–17 900, 21 400–21 500, and 22 200–22 500 cm−1 regions of the electronic ground state. It is concluded that respective vibrational levels are found to couple with each other by the network of Fermi and Coriolis interactions on the basis of the following grounds: (1) there are a number of Fermi pairs of the vibrational levels, and (2) the number of vibrational levels identified as the final states of the SEP transitions increases for rotational levels with larger rotational quantum numbers J and Ka. The distribution of the nearest neighbor vibrational level spacing shows that the vibrational quantum dynamics in the observed regions is almost quasiperiodic and the onset of the quantum chaos is estimated to be above 17 900 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453780
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  • 4
    Electronic Resource
    Electronic Resource
    Interatomic potentials of A 30+ and B 31 states of HgHe, HgNe, and HgAr van der Waals complexes (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 205-212 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational structures of A–X and B–X vibronic transitions of HgHe, HgNe, and HgAr van der Waals (vdW) complexes formed in supersonic free jets have been investigated. An analysis of the rotational contours shows that rotational structures for the six isotopic species, mHgHe, mHgNe, or mHgAr (m=204,202,201,200,199, and 198), are overlapped, and the observed isotopic splittings are utilized for the definite assignment of the vibrational quantum numbers in the A and B states. Based on the vibrational level spacings and the rotational constants, interatomic potentials for the A and B states of HgNe and HgAr are determined with good accuracy. In the case of the B state of the 199HgRg and 201HgRg (Rg=Ne or Ar), magnetic dipole hyperfine splittings are observed and analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454637
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  • 5
    Electronic Resource
    Electronic Resource
    Vibrational level structure of highly excited SO2 in the electronic ground state. II. Vibrational assignment by dispersed fluorescence and stimulated emission pumping spectroscopy (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4044-4054 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dispersed fluorescence (DF) spectra for the fluorescence emitted from eight single rovibronic levels in the C˜ 1B2 state are observed. The vibrational quantum numbers for these levels are (v'1,v2,v'3) =(0,0,0), (0,1,0), (0,2,0), (0,0,2), (1,0,0), (1,1,0), (1,2,2), and (3,1,0). The 484 vibrational levels distributed between 4300 and 21 600 cm−1 in the electronic ground state X˜ 1A1 are identified based on the assignment of the 1388 transitions in the DF spectra. The vibrational level energy is expressed by an anharmonic expansion with 19 coefficients and the vibrational quanta for the three normal modes. The combination analysis of the DF and stimulated emission pumping spectra having the same upper rovibronic level clarifies the vibrational level structure in the vibrationally highly excited region above 17 000 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457766
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  • 6
    Electronic Resource
    Electronic Resource
    Vibrational assignments and intensity considerations of the fluorescence excitation spectra of jet-cooled S1 trans-stilbene and its three isotopic analogues (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3884-3894 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational mode assignments of S1 trans-stilbene (tSB) in a jet, particularly those for fundamental vibrational levels above the isomerization barrier, are reported with three partially isotope-substituted analogues (C6 H5 –13CH=13CH–C6 H5 , C6 H5 –CD=CD–C6 H5 , and C6 D5 –CH=CH–C6 D5 ). Vibrational levels are assigned on the basis of the frequency shifts due to isotopic substitution. The established mode assignments then enable us to discuss the individual band intensities in the fluorescence excitation spectra which bear mode specific information on the isomerization dynamics in isolated tSB molecules. Upon deuteration, the intensities of several CH deformation modes increase drastically as their frequencies become lower than the isomerization barrier. Intensities of several fundamental bands are found much smaller than those of nearby combination bands, contrary to what is expected from ordinary absorption spectra in condensed phases. The intensity ratio of the 71 (C=C stretch) to the 00 band is semiquantitatively studied with reference to a molecular-orbital calculation, the resonance Raman intensity, and the absorption intensity in a low-temperature crystal. The unusually low fluorescence excitation intensities are ascribable to large isomerization rates specific to certain kinds of fundamental vibrational levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456820
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  • 7
    Electronic Resource
    Electronic Resource
    High resolution vacuum ultraviolet fluorescence excitation spectrum and predissociation of A˜ 1A‘ HCN (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 3988-3989 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The A˜–X˜ fluorescence excitation spectrum of HCN has been recorded using 4-wave mixing in Sr vapor as a tunable vacuum ultraviolet source. The excitation spectra are notable for the high signal to noise ratio, resolution (FWHM ∼0.3 cm−1) of nearly all previously blended lines, and accuracy of wavelength calibration (±0.03 cm−1). Measured lifetimes for the first three bending levels of the A˜ state [τ(000)1=13±7 ns, τ(010)1=130±24 ns, and τ(020)1〈2 ns] qualitatively confirm the results of Hsu, Smith, and Wallace [Chem. Phys. Lett. 111, 219 (1984)]. Stern–Volmer fluorescence quenching studies reported here yield a best fit quenching constant for the A˜(000)1 rotational levels of Kq =73/μs⋅Torr, which is similar to the quenching constant of the A˜(010)1 level (Kq =24.3±0.4/μs⋅Torr).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457809
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  • 8
    Electronic Resource
    Electronic Resource
    Rydberg and ion-pair state mixing in the 1 1Σ+u and 2 3Πu vibronic states of Cl2 as studied by vacuum ultraviolet laser spectroscopy (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 111-120 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fluorescence excitation and resonantly enhanced photoionization spectra of jet-cooled Cl2 in the 71 000–77 500 cm−1 region are measured using a tunable vacuum ultraviolet light generated by four-wave difference frequency mixing of two lasers in Kr. For the 1 1Σ+u state, vibrational term values for 35Cl2, 35Cl37Cl, and 37Cl2 and rotational constants for 35Cl2 and 35Cl37Cl are determined with high precision by the measurement of the 1 1Σ+u –X 1Σ+g transitions. It is shown clearly that the v'=39 vibrational wave functions of the 1 1Σ+u state of 35Cl2 and 35Cl37Cl are localized in the Rydberg well while the vibrational wave functions for the v'〈39 levels are delocalized in the ion-pair well and those for the v'〉39 levels are between the inner Rydberg wall and the outer ion-pair wall. A double minimum potential composed of the Rydberg and the ion-pair states explains well the observed vibrational and rotational structures. The molecular constants for the Rydberg well of 2 3Π(0+u) determined from the rovibrational structures of the 2 3Π(0+u)–X 1Σ+g transitions are ωe=647.3(33) cm−1, ωexe=3.37(59) cm−1 and re=1.833(20) A(ring), respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459610
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  • 9
    Electronic Resource
    Electronic Resource
    Interatomic potentials of the C1 and D0+ states of XeNe, XeAr, and XeKr as studied by tunable vacuum ultraviolet laser spectroscopy (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1560-1567 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fluorescence excitation and resonantly enhanced photoionization spectra of the C–X and D–X bands of XeNe, XeAr, and XeKr, formed in a supersonic free jet are measured by use of a tunable vacuum ultraviolet light generated by four-wave difference frequency mixing of two lasers in Kr. The potential parameters of the heteronuclear rare gas dimers for the two excited state potentials, C1 and D0+, correlated with the Xe6s'(1/2)1 state are derived by an analysis of rovibronic structures of the C–X and D–X bands. The dissociation energies De for the C and D states are, respectively, determined to be 244 and 112 cm−1 for XeAr and are 1445 and 54 cm−1 for XeKr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458087
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and predissociation of electronically excited HgN2 complex (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2975-2984 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structure and the predissociation dynamics of an excited van der Waals (vdW) complex HgN2 which is produced in a supersonic jet, have been investigated by means of laser-induced fluorescence (LIF) spectroscopy. The vibronic systems of the A–X and B–X transitions are analyzed in terms of the vdW bond stretching and the Hg–N2 bending modes. The predissociation process, HgN2(A or B)→Hg(3P0)+N2, in both of the A and B vibronic states has also been discussed by detecting Hg(3P0) as a predissociation product. Assignment of vibrational quantum numbers for the vdW bond stretching mode is made on the basis of the observed splittings among isotopic species for mHgN2 (m=198, 199, 200, 201, 202, and 204). Rotational contour analysis of the LIF and the 3P0 formation spectra is performed to determine (1) the branching ratio for the fluorescence and the predissociation processes as a function of vibrational and rotational quantum numbers and (2) potential functions for the A and B states along the vdW bond coordinate. The dissociation energies of the complex in the A and B states are determined to be 660(77) and 41(8) cm−1, respectively, and the equilibrium distances between Hg and c.m. of N2 are 3.08(2) and 5.37(10) A(ring) for the respective two states. Based on the simulation of the Franck–Condon profile of the bending progressions for the A–X band, the equilibrium configurations for the X and A states are estimated to be T shaped and linear, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455003
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