Spectroscopy of the a3u+ state and the coupling to the X1g+ state of K2
Abstract
We report on high resolution Fourier-transform spectroscopy of fluorescence to the a3u+ state excited by two-photon or two-step excitation from the X1g+ state to the 23g state in the molecule K2. These spectroscopic data are combined with recent results of Feshbach resonances and two-color photoassociation spectra for deriving the potential curves of X1g+ and a3u+ up to the asymptote. The precise relative position of the triplet levels with respect of the singlet levels was achieved by including the excitation energies from the X1g+ state to the 23g state and down to the a3u+ state in the simultaneous fit of both potentials. The derived precise potential curves allow for reliable modeling of cold collisions of pairs of potassium atoms in their 2S ground state.
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