Intermolecular potentials, internal motions, and spectra of van der waals and hydrogen-bonded complexes.

2.3. Symmetry Aspects 4112 2.4. Computation of the Spectrum 4113 3. Rovibrational Spectrum of Argon−Methane 4113 3.1. The Schrödinger Equation and Its Solution 4114 3.2. The Spectrum and Its Assignment 4117 4. Water Pair Potential and Dimer Spectrum 4118 4.1. Tunneling Processes in the Water Dimer 4119 4.2. Dynamics Calculations 4120 4.3. Pair Potential and Dimer VRT Levels 4121 5. Three-Body Interactions; Water Trimer Spectrum 4123 5.1. Torsion and Bifurcation Tunneling 4124 5.2. Torsional Model Hamiltonian 4126 5.3. Effective Rotational and Tunneling Hamiltonian 4127