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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic field effects on the single-rovibronic-level fluorescence of S1(1B1) pyrimidine: Study of the singlet–triplet coupling by level anticrossings and quantum beats (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 5697-5701 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Level anticrossings and quantum beats have been observed for the fluorescence from single rotational levels of the vibrationless S1 pyrimidine in a supersonic free jet. The density of triplet levels (ρ) and the coupling matrix elements (v) deduced from the data obtained for R(0) transition confirm that the singlet–triplet coupling belongs to the weak coupling limit (vρ(very-much-less-than)1) of interstate interaction, in which electronic relaxation from the prepared singlet state to the triplet manifold does not occur in the absence of collisions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472414
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Toluene internal-rotation: Measurement and simulation of the high-resolution S1–S0 fluorescence excitation spectrum at 0.5 K (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 167-175 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational structure in the origin band of the S1–S0 fluorescence excitation spectrum of toluene has been measured at 0.012 cm−1 resolution with a rotational temperature of 0.5 K using a pulsed beam apparatus. Such spectra have been obtained for the parent isotopomer and for the isotopomers with mono- and di-deuterated methyl groups. These, and previously known forbidden bands in which the internal-rotation quantum number Ki changes, are simulated here using ab initio internal-rotation-angle-dependent geometries, potential functions, and electronic transition moment function. An adjustment of some of the ab initio parameters allows a close fitting of the spectra to be made, and this can only be achieved if bond lengths and angles are allowed to vary with internal rotation. The resulting geometries for ground and excited-state toluene are the most accurate to date. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480571
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    Paper (German National Licenses)
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