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  • 1
    Electronic Resource
    Electronic Resource
    Spin uncoupling in 3A2 CS2 studied by high-resolution Zeeman and hyperfine quantum beat spectroscopy (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8761-8769 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The magnetic properties of the evsB2 spin component of the 3A2 state in the molecule CS2 have been investigated with a resolution of ∼100 kHz by quantum beat spectroscopy in a supersonic jet. Zeeman-level tuning in 12CS2 and 13CS2, providing Landé g factors, and measurements of the 13CS2 nuclear hyperfine structure were carried out, particularly to investigate their J dependence. Based on these results, it is proposed that both the magnetic moment and the hyperfine splitting are dominated by spin-uncoupling interactions, described in the rotational Hamiltonian by B(J−S).2 In addition, the g factors and rotational state lifetimes were used to provide spectroscopic assignments and to elucidate details of the state mixing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462283
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rydberg states near the ionization continuum: Autoionization in ammonia (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6523-6528 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Previously undetected autoionizing Rydberg levels of ammonia which exist in the energy region between the first ionization continuum and the first excited vibrational level of the NH+3 ion have been measured. Jet cooled ammonia molecules in high lying Rydberg levels were detected by a two-color, three-photon excitation resonantly enhanced multiphoton ionization process, 2+1'. The Rydberg series can be assigned to a continuation of the (a2‘)(nsa1') series to which the A˜, D˜', and E˜‘ states belong. A vibronic autoionization mechanism based on the electrostatic and linear terms [V0 and (∂V/∂Q)Q, respectively] in the potential energy expansion has been suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468346
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Adsorption of L -Tryptophan to the H2O–CCl4 Interface, Monitored by Red-Edge Two Photon-Induced Polarized Fluorescence (1998)
    Springer
    Journal of fluorescence 8 (1998), S. 243-252 
    Details
    ISSN: 1573-4994
    Keywords: Liquid interfaces ; fluorescence polarization ; multiphoton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The adsorption of L-tryptophan to the H2O–CCl4 interface has been studied using the novel method of two photon-induced fluorescence polarization. The process of two-photon absorption allows excitation of a very small volume of molecules near an interface. In the instance where molecules maintain a preferential orientation at the interface, interface-specific phenomena are observed as a dependence of the absorption and emission processes on the polarization of the light. In this way, an isotherm for the adsorption of L-tryptophan from the bulk aqueous phase to the H2O–CCl4 interface was determined. Associated with this process is a change in free energy of $$\Delta \bar G_{{\text{ad}}}^0 = - 19 \pm 3$$ kJ/mol. By comparing the free energy of adsorption in this study to that at the H2O–CH3(CH2)6CH2OH interface, we find that L-tryptophan binds more readily to the H2O–CCl4 interface. Our polarization data suggest that the plane of the indolyl chromophore of tryptophan is oriented in a more parallel than perpendicular fashion to the liquid–liquid interface. Additionally, we present a mechanism for the observed two-photon absorption, 20 nm to the red of the traditional onset of the transition into the first excited singlet state of tryptophan in aqueous solution. This mechanism involves simultaneous hot-band transitions into the 1La state and direct excitation into the triplet manifold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022509817634
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    Paper (German National Licenses)
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