| Popis: |
Irradiation of α-cinnamic acid crystals at their absorption tail at 365 and 405 nm and with filtered daylight gives surface features due to long-range molecular movements and phase rebuilding similar to the features in the shorter wavelength irradiations. AFM measurements indicate that the molecular migrations are guided by the crystal structure. Features such as walls, fences and trenches all follow the direction of the cleavage planes at 39° to the c−axis. Volcano-like features also require upward molecular transport. The visibly detectable disintegration of the crystals at low conversions in all cases is studied in some detail. A topotactic reaction is not observed. |
