Rotational and rotationless states of weakly bound molecules - Lemeshko, Mikhail; Friedrich, Břetislav (Physical Review A - Atomic, Molecular, and Optical Physics, 2009)
By making use of the quantization rule of Raab and Friedrich [Phys. Rev. A 78, 022707 (2008)], we derive simple and accurate formulae for the number of rotational states supported by a weakly bound vibrational level of a diatomic molecule and the rotational constants of any such levels up to the threshold, and provide a criterion for determining whether a given weakly bound vibrational level is rotationless. The results depend solely on the long-range part of the molecular potential and are applicable to halo molecules.
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