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Orientation of Single Dibenzanthanthrene Molecules in Solid Xenon

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Sepioł J., Kołos R., Jasny J.
Acta Physica Polonica A
|
2007
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vol. 112
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issue S
S-121-S-126
EN
The spatial distributions of individual dibenzanthanthrene electronic transition dipole moments in solid Xe was investigated at the single molecule level, with the high-resolution fluorescence spectroscopy. Samples were prepared by the co-deposition of dibenzanthanthrene/Xe vapours onto the 50 K surface. The results indicate that the orientation of planar aromatic molecules is preferentially parallel to the trapping surface.
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Picosecond Transient Absorption Spectra and the Twisted Intramolecular Charge Transfer Phenomenon

100%
Dobkowski J., Grabowski Z. R., Jasny J., Zieliński Z.
Acta Physica Polonica A
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1995
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vol. 88
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issue 3
455-468
EN
An improved model of a computer-controlled picosecond absorption spectrometer was designed and constructed. Its operation is described, and applied to the measurement of transient spectra of p-N, N-dioctylamino-acetophenone. The spectroscopy and photophysics of this compound are compared to the other compounds exhibiting the dual fluorescence, assigned usually to the adiabatic formation of the "twisted" intramolecular charge transfer excited state. The data are discussed in relation to alternative suggestion of an inversion of the pyramidal amino nitrogen atom. The whole evidence supports the decoupling of the π-electronic systems of D+ and A- in the D+-A- polar excited state, in full accord with the "twisted" intramolecular charge transfer model. The peculiar behaviour of the long alkyl -NR2 derivatives (favouring the "twisted" intramolecular charge transfer state emission) seems to be primarily due to the decreasing oxidation potential of such electron donor groups.
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