Journal article
Ultrafast optical dynamics of spiro-compounds
Publication Details
Authors: | Fuhrmann, T.; Salbeck, J. |
Publication year: | 2001 |
Journal: | Synthetic Metals |
Pages range : | 1497 |
Volume number: | 121 |
ISSN: | 0379-6779 |
Abstract
We report on time-resolved measurements of spiro-type molecules in the ps- and fs-timescale. Due to the orthogonality of the transition dipoles of two identical moieties connected through a spiro-atom, one expects these compounds to show two perpendicular, degenerate states that may enter into a complex free evolution upon fs excitation. On ps scales the bichromophoric units behave as isolated absorbers, thus their fluorescence stems from localized site populations. Level relaxation gives rise to slightly non-exponential relaxation that can be quantified in terms of finderlying life-time distributions by employing numerical Laplace inversion. Fs fluorescence upconversion experiments have been employed to elucidate, for the first time, nuclear and electronic dynamics subsequent to broad-band fs-preparation.
We report on time-resolved measurements of spiro-type molecules in the ps- and fs-timescale. Due to the orthogonality of the transition dipoles of two identical moieties connected through a spiro-atom, one expects these compounds to show two perpendicular, degenerate states that may enter into a complex free evolution upon fs excitation. On ps scales the bichromophoric units behave as isolated absorbers, thus their fluorescence stems from localized site populations. Level relaxation gives rise to slightly non-exponential relaxation that can be quantified in terms of finderlying life-time distributions by employing numerical Laplace inversion. Fs fluorescence upconversion experiments have been employed to elucidate, for the first time, nuclear and electronic dynamics subsequent to broad-band fs-preparation.
