Experimental
Determination of the Rotational Constants
of High-Lying Vibrational Levels of Ultracold Cs<sub>2</sub> in the
0<sub>g</sub><sup>–</sup> Purely
Long-Range State
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Abstract
We
report on a quantitative experimental determination of the rotational
constants for the high-lying vibrational levels of the ultracold pure
long-range Cesium molecules formed via photoassociation. The scheme
relies on a precise reference of frequency difference in a double
photoassociation spectroscopy, which is induced by two laser beams
based on an acoustic-optical modulator. The rotational constants are
obtained by fitting a nonrigid rotor model into the frequency intervals
of the neighboring rotational levels deduced from the reference