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Author: search.filters.author.Schweitzer, DieterAuthor: search.filters.author.Hausser, Karl H.Author: search.filters.author.Goldacker, WilfriedInstitute: search.filters.UBSInstitut.Sonstige Einrichtung

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Now showing 1 - 4 of 4
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    Transanular interaction in [2.2]phanes: models for dimers?
    (1979) Goldacker, Wilfried; Hausser, Karl H.; Schweitzer, Dieter; Staab, Heinz A.
    The emission spectra of pseudo-ortho 3 and pseudo-geminal-4,7,12,15-tetramethoxy[2.2]-paracyclophane 3 were measured in glass matrices at 1.3 K. Furthermore, the zero field splitting parameters D and E and the decay rate constants ki of the excited triplet state were studied by optical detection of magnetic resonance in zero field. The results were compared with the corresponding monomer 1,4-dimethyl-2,5-dimethoxybenzene.
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    ODMR of phanes and charge transfer phanes
    (1979) Schweitzer, Dieter; Goldacker, Wilfried; Hausser, Karl H.; Staab, Heinz A.
    Triplet zero field splitted parameters |D| and |E| and decay rates ki of the triplet sublevels of two stereoisomeric tetramethoxy [2.2] paracyclophanes as well as those of two CT [2.2] paracyclophanes in low concentration in glasses and small neat single ctystals as measured by ODMR in zero fields at 1,3 K are presented.
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    ZFS-tensor of the triplet states of [2.2]phanes as studied by ESR
    (1981) Bär, Monika; Dinse, Klaus Peter; Goldacker, Wilfried; Hausser, Karl H.; Schweitzer, Dieter; Zimmermann, Herbert; Krieger, Claus
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    Influence of an identified dimer vibration on the emission spectrum of [2,2]paracyclophane
    (1980) Goldacker, Wilfried; Schweitzer, Dieter; Dinse, Klaus Peter; Hausser, Karl H.
    The emission spectrum of polycrystalline [2,2]paracylophane shows a resolved vibronic structure with a 241 cm−1 progression at He temperatures. The dependence of the energy of this mode upon selective deuteration in combination with results from FIR and Raman spectra could be used to identify the mode as a torsional dimer vibration. The emission spectra could be simulated assuming a linear coupling of the torsional mode to the electronic transitions with coupling strengths of S = 10 (fluorescence) and S = 13 (phosphorescence). This corresponds to an equilibrium displacement of the benzene rings under electronic excitation by a torsional angle of 10.6° (S1) and 12.1° (T1), in addition to the small torsion in the ground state S0 by about 3°.