Triplet state kinetics of anthracene studied by pulsed electron paramagnetic resonance

Abstract

Photoexcited triplet states of anthracene in a glassy toluene matrix were investigated using pulsed UV–laser photoexcitation and pulsed electron paramagnetic resonance spectroscopy. The triplet lifetime, the triplet relaxation rates between the high-field eigenstates and the populations of the triplet sublevels are quantitatively analysed. High-quality data allows for supporting the former conclusion that excitations into the individual zero-field components proceed via independent channels.

Keywords:

• photoexcited triplet states
• triplet kinetics
• triplet population
• optical spin polarisation
• EPR spectroscopy

Acknowledgements

The authors thank Prof. Dr Gunnar Jeschke and Prof. Dr Ulrich Steiner for stimulating discussions, and the DFG for financial support (DR 743/2-1).