Vibrational analysis from quantum mechanic molecular dynamics trajectories

In this paper we report a vibrational analysis from Quantum Mechanic dynamic DFT based approaches. After a brief presentation of the dynamic simulation using the Atom Centered Density Matrix Propagation (ADMP) formalism, we compare in the case of methyl amidogen the vibrational spectra obtained from a Vibrational Configuration Interaction formalism and the molecular Dynamic approach. Except for the CH stretching modes, the results converge giving a good agreement with the experimental data. The second example concerns a larger sized molecular system, the Glycine radical. An interpretation of all the fundamental bands is given in the NOR area between 150 to 4000 cm(-1).