The ^1S+^1S asymptote of Sr_2 studied by Fourier-transform spectroscopy

Details The ^1S+^1S asymptote of Sr_2 studied by Fourier-transform spectroscopy The ^1S+^1S asymptote of Sr_2 studied by Fourier-transform spectroscopy

2010-01-15

arxiv.org/abs/1001.2741v2

Eur. Phys. J. D 57, 171 (2010)

Physics

Chemical Physics

Minor typing errors corrected and journal reference added.

Scientific paper

10.1140/epjd/e2010-00058-y

An experimental study of the long range behavior of the ground state X^1\Sigma^+_g of Sr_2 is performed by high resolution spectroscopy of asymptotic vibrational levels and the use of available photoassociation data. Ground state levels as high as v"=60 (outer turning point at 23 \AA and 0.1 cm^-1 below the asymptote) could be observed by Fourier-transform spectroscopy of fluorescence progressions induced by single frequency laser excitation of the v'=4, J'=9 rovibrational level of the state 2^1\Sigma^+_u. A precise value of the scattering length for the isotopologue ^88Sr_2 is derived and transferred to all other isotopic combinations by mass scaling with the given potential. The derived potential together with already published information about the state 2^1\Sigma^+_u directs to promising optical paths for producing cold molecules in the electronic ground state from an ultracold ensemble of Sr atoms.

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