Semiclassical approximations to real-time quantum-mechanical effects in correlation functions of complex molecular systemsComparison of the propagation of semiclassical frozen Gaussian wave functions with quantum propagation for a highly excited anharmonic oscillator J. Chem. Phys. 84, 326 (1986); 10.1063/1.450142 Semiclassical calculation of quantummechanical wave functions for a twodimensional scattering system A semiclassical spectral quantization (SQ) technique quite similar to that developed by De Leon and Heller is applied to a rigorous test case-the highly quantum mechanical vibrational motion of DCN on the excited C lA' potential energy surface. By using essentially arbitrary classical trajectories, SQ energies and wave functions are obtained for the 12 bound vibrational states of this system. These results tum out to be in remarkably good agreement with those also obtained in this lab from a totally quantal treatment of the same 12 vibrational states. Observations are made concerning the limitations of the SQ method and its performance when state degeneracies are present.