Infrared spectra of the van der Waals molecule (N2)2

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Abstract
All bound states of the (N2)2 dimer are calculated by solving the rovibrational problem for the rigid monomer hamiltonian, using an ab initio potential and a symmetrized product basis of angular momentum and associated Laguerre functions. Next we have evaluated the infrared line strengths for all the symmetry allowed bound-bound transitions, employing the empirical dipole function deduced from the collision induced far infrared spectrum and the N2 multipole moment and polarizability derivatives from ab initio calculations. Thus we have generated the (N2)2 dimer far-infrared spectrum, corresponding to pure van der Waals vibrations and rotations, and the mid-infrared spectrum in the region of the monomer fundamental stretch (2330 cm-1). Due to the strong anisotropy of the potential, on the one hand, but the lack of rigidness of the (N2)2 dimer, on the other, the spacing between vibrational levels and the shape of the rotational bands and, therefore, the appearance of the infrared spectra is very irregular.