Coupling of the ν7 CH stretch with ring modes in S1 benzene

Competing ultrafast intersystem crossing and internal conversion in the “channel 3” region of benzene

“…state 0.4 eV above D 0 . Benzene has four CH stretching modes with fundamental frequencies around 0.4 eV 23,48 and the n 7 (e 2g ) stretch has the right symmetry to be involved in a Fermi-resonance with an 'optically bright' vibrational state. In this respect, our experimental data is unable to distinguish unambiguously the origin of the oscillation.…”

“…A detailed dispersed fluorescence study of the only vibrational state including the fundamental n 7 CH stretch in this region of the spectrum (B3080 cm À1 ) was unable to locate any Fermi-resonances involving the n 7 mode. 48 The usual meaning of IVR is associated with a coupling to a number of states and can be characterised by a Fermi golden rule rate of decay, 49…”