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Classification of the fundamental modes (k = 0) for the N,N-dimethylglycine –chloranilic acid (DMG+–CLA−) co-crystal.
| UCG | Lattice Modes | Internal Modes | Selection Rules | ||||
|---|---|---|---|---|---|---|---|
| Ci | Ac. | Trans. | Rot. | DMG+ | CLA− | IR | Raman |
| Ag | 12 | 12 | 90 | 66 | x2, y2, z2, xy, xz, yz |
||
| Au | 3 | 9 | 12 | 90 | 66 | x, y, z | |
UCG—unit cell (factor) group; Ac.—acoustic modes; Trans.—translation modes; Rot.—rotation modes.
