Dear Colleagues, A lot of good software for visualizing IR vibrations exists today. However, movies seem insufficient in case of complex systems like cluster models with "adsorbed" molecules on them. I'd like to find out if there are any methods or software allowing assignment (approximate, of course) of normal modes to this or that group of atoms when given normal vibration forms. Thank you. SY, Yar Yaroslav Tikhiy <yar # - at - # radio-msu.net>