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Predissociations in the 0u+ and 1g States of K2



T Bergeman, Paul S. Julienne, Carl J. Williams, Eite Tiesinga, M R. Manaa, H Wang, P L. Gould, W C. Stwalley


Recently Wang, Gould and Stwalley showed by exciting atomic fragments that predissociation occurs in the Ig and O+u states of K2. In this study, we supplement the interpretation given in the original report with a more detaileddiscussion. The calculations presented here use discrete variable representation (DVR), close coupling, and semiclassical methods, and incorporate an ab initio calculation of diagonal and off-diagonal spin-orbit elements. The predicted predissociation widths for the Ig state are too narrow to be observed directly, but may be correlated with the strength of the spectral lines observed by exciting atomic fragments. The mising Ņ=90 level of the 1g state in the observed fragmentation spectrum, where the predissociation rate is calculated to be nearly maximum, is attriibuted to a node in the absorption line strength close to this vibrational level. Since the available information on K2 electronic states (despite recent progress) gives inadequate information on the inner walls of the A state and especially of the b state, calculations of predissociation in the O+/u state can give only a range of possible widths. We fit widths to O+/u spectral lines observed by monitoring trap loss. The fitted experimental widths aresignificantly larger than the maximum calculated predissociation widths, suggesting that there was line broadening associated with the laser power required for the observation.
Journal of Chemical Physics
No. 16


photoassociation spectroscopy, potassium dimer, predissociation, spin-orbit interactions, ultra-cold collisions


Bergeman, T. , Julienne, P. , Williams, C. , Tiesinga, E. , Manaa, M. , Wang, H. , Gould, P. and Stwalley, W. (2002), Predissociations in the 0<sub>u</sub><sup>+</sup> and 1<sub>g</sub> States of K<sub>2</sub>, Journal of Chemical Physics (Accessed June 19, 2024)


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Created September 30, 2002, Updated October 12, 2021