Static pictures of molecules are only half-true because atoms are always in motion. Complex motion of molecules can be decomposed into a finite set of "elementary" moves called "normal modes" with defined frequences which can be measured by infrared and Raman spectroscopy and calculated by several methods.
Molecule Al2Cl6 is assumed as a short-living entity in liquid AlCl3. Its properties are responsible for dramatic decrease of density when solid AlCl3 is melted. The normal mode vibration results are based on a new polarizable force field for MD simulations on molten salts containing Li+, Al+3, Cl-, and I-. There are 18 modes for this molecule. First two slowest modes follow.
Show all modes (18 animated pictures of about 50KB each)
[back to J. Kolafa homepage]