Quantitative normal mode analysis

 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>