The NH–He van der Waals complex was characterized via laser excitation of bands associated with the NH transition. It was demonstrated that the ground state supports a bound level with a rotational constant of B″=0.334(2) cm−1. These results are in agreement with the predictions of recent high-level theoretical calculations. Spin–orbit predissociation of the excited complex was observed, and the spectra yield insights regarding the NH(A)+He potential energy surfaces.
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