Abstract
We apply second-order multireference Rayleigh-Schrodinger perturbation theory to obtain the adiabatic potential energy surface of the 1 (4)A(2)(') lowest quartet state and the 2 (4)E(') excited state of K(3) and Rb(3). Both trimers show a typical Emultiply sign in circlee Jahn-Teller distortion in their 2 (4)E(') state, which is analyzed in terms of relativistic Jahn-Teller effect theory. Linear, quadratic, and spin-orbit coupling terms are extracted from the ab initio results and used to generate simulated spectra for a direct comparison with laser-induced fluorescence and magnetic circular dichroism spectra of alkali-doped helium nanodroplets [Aubock et al., J. Chem. Phys. 129, 114501 (2008)].
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