Photoelectron studies on vibronic coupling in pyrazine

de Groot, Mattijs; Buma, Wybren Jan
September 2007
Journal of Chemical Physics;9/14/2007, Vol. 127 Issue 10, p104301
Academic Journal
Ionization pathways from the S1 and T1 states of pyrazine are investigated using one- and two-photon ionization of the excited state by both resonance enhanced multiphoton ionization photoelectron spectroscopy and zero electron kinetic energy pulsed field ionization techniques. For the triplet manifold, we show that two-photon ionization of T1 is enhanced by a vibronically induced resonance for which we determine the inducing mode and the nature of the intermediate state, as well as the Rydberg state. For the singlet manifold, we identify the mode responsible for the vibronically induced intensity of a 3p Rydberg state that was previously found to greatly perturb the 1+2′ photoelectron spectrum of S1 by a resonance at the two-photon level.


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