THEORETICAL-STUDIES OF CLUSTERING ROVIBRA TIONAL ENERGY-LEVELS IN THEHIGHLY EXCITED H2O MOLECULE

The clustering of rovibrational energy levels in the highly excited H2 O molecule has been investigated by using a variational procedure and the bending - rotation Hamiltion in which the radial cooridates are fi xed to their equilibrium values. This clustring effects begins with th ecritical value of total angular momentum J(c), which for H2O is 26. T he appearance of four - fold clusters of energy levels as consequence of molecular geometry stabilization is predicted. This clustering stru cture has not been brokendown in the excited vibrational states.