Photoassociative spectroscopy of the \(\) long-range state
The photoassociative spectroscopy of the Cs20g - long-range molecular state dissociating into the \(\)asymptote is performed, using cold cesium atoms in a vapor-cell magneto-optical trap (MOT). Vibrational levels from v=0 to v=132 are identified, and their rotational structure is well resolved up J=8 for levels below v=74. These data are analyzed in terms of the Rydberg-Klein-Rees (RKR) procedure, and correspond to 99.6% of an effective potential curve with a minimum at \(\)Å and a \(\) cm-1 depth. Both ab initio calculations and simple model estimations predict a double-well structure for this potential curve, which cannot be reproduced presently by the RKR approach but which is confirmed by the presence of giant structures in the spectrum. The 1u(\(\))long-range state is also observed for the first time in Cs2.
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