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Homo- and heteronuclear alkali quartet trimers of the type K_{3-n}Rb_{n}(n=0,1,2,3) formed on helium nanodroplets are probed by one-color femtosecondphotoionization spectroscopy. The obtained requencies are assigned tovibrations in different electronic states by comparison to high level ab initiocalculations of the involved potentials including pronounced Jahn-Teller andspin-orbit couplings. Despite the fact that the resulting complex vibronicstructure of the heavy alkali molecules complicates the comparison ofexperiment and theory we find good agreement for many of the observed lines forall species.

Homo- and heteronuclear alkali metal trimers formed on helium nanodroplets. II. Femtosecond spectroscopy and spectra assignments