Clustering of rovibrational energy levels in the highly excited H2S molecule

The dynamics of the highly excited H2S molecule is investigated. Calculations up to J = 40 are performed for the bending-rotational Hamiltonian by applying a self-consistent methodology. Centrifugal destabilization and stabilization of the molecular geometry is discussed. The appearance of fourfold clusters of energy levels as a consequence of molecular-geometry stabilization is predicted. It is established that the lowest value of J for which clusters emerge is 24.