Simulation of perturbed gamma-gamma angular correlation spectra for non-linear molecules

In what polyatomic molecules is concerned, we are intended to solve the total energy, in a certain approximation, into the sum of rotational, vibrational and electronic energies. However, this approximation is not as accurate as for diatomic molecueles. Therefore in this project we will just keep into account the pure rotation of polyatomic molecules neglecting the interaction with the vibration and with the electronic motion: rotations of a non-vibrating molecule in a fixed (symmetrical) electronic state. Depending on how different are the principal moments of inertia for every molecule, we can distnguish among asymmetric top, symmetric top or spherical top molecules during the rotational motion. Here, the concept of electric quadrupole moment plays an important role.