Split operator method in hyperspherical coordinates: Application to CH₂I₂ and OCIO

3D wave packet calculations on the CH₂I₂ and OCIO molecules have been performed for a total angular momentum equal to zero. The initial wave function is found by solving the time independent Schrödinger equation in internal bond coordinates. The split operator method and the fast Fourier transform in hyperspherical coordinates are used in order to follow the quantum dynamics. An absorption spectrum of CH₂I₂ is obtained and compared with a previous 2D calculation. A Raman spectrum for the CH₂I₂ molecule at 355 nm is calculated and compared with experimental results. The absorption spectrum for the X²B₁→A²A₂ transition of the OCIO molecule is calculated using the same method as for CH₂I₂. Good agreement with experiment is obtained.