Abstract
We present time-resolved photoelectron spectra in combination with quantum chemical calculations based on time-dependent density functional theory for the study of the long-lived excited state of . The experimental spectra indicate an excited state lifetime of at least . It is shown that the orbital symmetry of the photoexcited state as well as the planarity of are responsible for the unusual long lifetime. A possible decay mechanism is the fluorescence of a photon which is estimated to take place on a time scale of .
- Received 24 May 2007
DOI:https://doi.org/10.1103/PhysRevB.76.155422
©2007 American Physical Society