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  • 1
    Electronic Resource
    Electronic Resource
    Ion pairing and solvation effects in the intra-5f2 absorption spectra of dimeric uranium(IV) alkoxide complexes (1993)
    s.l. : American Chemical Society
    Inorganic chemistry 32 (1993), S. 647-653 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00057a027
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  • 2
    Electronic Resource
    Electronic Resource
    Early actinide alkoxide chemistry. Synthesis, characterization, and molecular structures of thorium(IV) and uranium(IV) aryloxide complexes (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 10811-10821 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00053a017
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  • 3
    Electronic Resource
    Electronic Resource
    One- and two-photon spectroscopy of the 3Eg state of NaF:Cu+: Observation and analysis of vibronic fine structure (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 7-19 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: One- and two-photon laser excitation spectra of the 1A1g→3Eg transition of NaF:Cu+ are reported, these being the first direct observations of the lowest d9s excited state of Cu+ in an alkali halide host. The spin–orbit splitting of the 3Eg vibronic origin is directly measured, and can be compared with values inferred from studies of the temperature and magnetic field dependence of the emission lifetime. Clear vibrational progressions based on both spin–orbit origins are assigned to odd parity local modes of t1u symmetry. We also report high resolution emission spectra which reveal evidence of a corresponding local mode in the ground state with a fundamental frequency significantly higher than that observed in any of the d9s excited states. We model these spectroscopic data and those of the 1Eg and 1T2g states within the adiabatic approximation using three-parameter anharmonic vibrational potentials, evaluating the energies and wave functions by a variational procedure. Good fits are obtained for most spectroscopic features. Those features which are not accommodated by the adiabatic model potentials are accounted for by nonadiabatic vibronic coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453528
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  • 4
    Electronic Resource
    Electronic Resource
    Selective excitation and analysis of NaF:Cu+ electronic transitions using two-color, two-photon spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3915-3930 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nonresonant, one-color and two-color, two-photon excitation spectra of d10→d9s transitions in NaF:Cu+ at T〈15 K are presented. The two-color method is shown to provide a means of using the symmetry selectivity of two-photon excitation to its fullest extent to separate cleanly bands normally distorted or obscured by other transitions. The spectra give unambiguous assignments and accurate energies of the T2g(3T2g) and Eg(3T2g) electronic states within the d9s excited state manifold. Vibronic fine structure is observed at the electronic origins of transitions to each of these states. This structure aids in band assignment and in analysis of the symmetric mode vibrational potentials in the excited states. Band intensities are analyzed and vibronic fine-structure linewidths are interpreted in terms of nonradiative relaxation. These new data require a reassessment of the assignment of the bands previously attributed entirely to transitions to the 1Eg state. It is suggested that Jahn–Teller splitting does not distort this state to a spectroscopically observable degree, contrary to earlier interpretations of the spectra, and that only the lower energy of the two Eg bands originates from transitions to the state ofprimarily singlet character. Observed spin–orbit coupled energy levels are modeled using crystal field splittings, singlet–triplet splittings, and the Cu+3d spin–orbit constant as variable parameters. The resulting fit gives energies and intensities which are in agreement with all measured experimental values if ζ3d is approximately equal to its free ion value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455802
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  • 5
    Electronic Resource
    Electronic Resource
    Two-photon electronic spectroscopy of Cs2GeF6:Mn4+ (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 4168-4173 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectrum of the d→d transitions of Mn+4 in Cs2GeF6 has been observed by means of two-photon spectroscopy using a tunable infrared laser. The g→g two-photon spectrum is fully allowed and therefore, shows the true electronic origins and symmetric vibrational sidebands without any interfering odd parity vibrations. The resulting spectra for each of the four electronic states studied (2Eg,2T1g,4T2g,a 4T1g), a 4T1g), are free of lattice mode and enabling mode complications and provide data for the analysis of Jahn–Teller effects, spin-orbit coupling, and other dynamical processes at the impurity ion. In the 4T2g, state there is clear evidence both in the quenching of the origin quartet, and in the vibronic structure for both e- and t2-type Jahn–Teller distortions. Each of the four states shows a specific, and a different mode of coupling to the lattice. Many other spectroscopic details are revealed, none of which were evident in the one-photon spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450036
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    Paper (German National Licenses)
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