Photophysical hole burning in the excited state absorption bands of dissolved organic molecules at room temperature

Abstract

Photophysical hole burning (PPHB) on dissolved organic molecules in the liquid phase usually occurs only in picosecond or femtosecond experiments because of the short hole decay time. On molcules with comparably short absorption recovery times PPHB can be observed under the steady-state conditions of nanosecond experiments, too. PPHB experiments in the excited-state absorption bands are not restricted to these molecules because of Kasha's rule. Consequently PPHB nanosecond experiments on excited states represent a new approach for investigation and application of the PPHB processes. Results of absorption and PPHB measurements on the excited state of p-terphenyl are given.