Ultrafast Decay Dynamics of 2-Hydroxypyridine Excited to S1 Electronic State

The S-1 state decay dynamics of 2-hydroxypyridine following UV excitation at a wavelength range of 276.9-250.0 nm is investigated using femtosecond time-resolved photoelectron imaging technique. Based on pump wavelength dependence of the decay dynamics, a refined decay picture is proposed. At pump wavelength of 276.9 nm, the S-1 state is depopulated through intersystem crossing to lower triplet state(s). At 264.0 nm, both intersystem crossing to lower triplet state(s) and internal conversion to the ground state are in operation. At 250.0 nm, internal conversion to the ground state becomes dominated.

Automated summary

The decay dynamics of the S-1 state of 2-hydroxypyridine following UV excitation was investigated using femtosecond time-resolved photoelectron imaging technique. The experimental results showed that the decay process of the S-1 state varied with different pump wavelengths, indicating the contribution of intersystem crossing and internal conversion to the decay of the S-1 state.