de Groot Mattijs, Buma Wybren Jan
Van't Hoff Institute for Molecular Sciences, Faculty of Science, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands.
J Chem Phys. 2007 Sep 14;127(10):104301. doi: 10.1063/1.2764075.
Ionization pathways from the S(1) and T(1) 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 T(1) 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 (3)3s(n(-1)) 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 S(1) by a resonance at the two-photon level.
利用共振增强多光子电离光电子能谱和零电子动能脉冲场电离技术，通过激发态的单光子和双光子电离来研究吡嗪S(1)态和T(1)态的电离途径。对于三重态系综，我们表明T(1)的双光子电离通过一个振动诱导共振得到增强，我们确定了该诱导模式、中间态的性质以及(3)3s(n(-1))里德堡态。对于单重态系综，我们确定了一个3p里德堡态的振动诱导强度的相关模式，该模式先前被发现通过双光子能级的共振极大地扰动了S(1)的1+2(')光电子能谱。
