| Autor: |
Salgado, F. Perez, Herbich, J., Kunst, A. G. M., Rettschnick, R. P. H. |
| Zdroj: |
The Journal of Physical Chemistry - Part A; April 29, 1999, Vol. 103 Issue: 17 p3184-3192, 9p |
| Abstrakt: |
The first experimental evidence is presented for a strong coupling between electronic states in isolated, supercooled 4-(N,N-dimethylamino)benzonitrile, DMABN. In the fluorescence excitation spectrum, measured under isolated supercooled conditions, two types of transitions were found (B-type and C-type). Rotational contour analysis of the B-type bands (ππ* character) shows that there is hardly any difference between the geometries of the ground and excited states; the molecule retains its planar conformation. In the out-of-plane transition (C-type band) the equilibrium position of the dimethylamino group twists 90° with respect to the benzonitrile part. The broadening of the rotational lines indicates that the fluorescence is preceded by a fast radiationless intramolecular process (internal conversion) on a picosecond time scale. For the B-type bands it was found that the broadening increases with the vibrational energy. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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