Experimental and theoretical studies of the coupled A1\Sigma+ and b3\Pi states of NaKстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 11 августа 2015 г.
Аннотация:We report an extensive series of transitions (including collisional transfer lines) from pure and mixed levels of the NaK A1\Sigma+ and b3\Pi states to the X1\Sigma+ state, observed in Lyon using Fourier transform spectroscopy. We then combine these data with previously reported data on these states from emission from the B1\Pi and C1\Sigma+ states and from mutually perturbed levels of the D1\Pi and d3\Pi states. We obtain 2758 distinct term values: the full data set includes 11624 term values, with many multiple determinations from transitions over a range of vibrational and rotational levels. The data are analyzed by fitting to potentials of the ``Hannover'' form (Samuelis et al., Phys. Rev. A {\bf 63}, 012710 (2000)) plus spin-orbit (SO) functions in a simple Morse form, yielding an rms residual of approximately 0.029 cm-1. The empirical SO functions agree well with their {\it ab initio} counterparts obtained from electronic structure calculations based on non-empirical effective core potentials. From level energies of the A-b complex calculated from the fitted potentials and SO functions, we identify reasonable candidates for transitions between Feshbach resonance states and mixed singlet-triplet gateway levels of the A1\Sigma+-b3\Pi manifold leading either to v=0 levels of the X state, or to mixed singlet-triplet levels at higher energies that can be used for perturbation-facilitated double resonance experiments.