Abstract
Laser- and light-induced charge density variations in organic molecular single crystals of 2-benzyl-5-benzylidene-cyclopentanone (BBCP) have been investigated using high resolution x-ray diffraction and spectroscopic methods.In BBCP single crystals a cyclobutane ring is formed from two parallel double bonds of neighbouring molecules by light irradiation. Due to this photodimerization, the bond lengths, bond angles and electron density are strongly changed near the C = C double bonds in the molecules, as has been shown by spectroscopic techniques and diffraction methods.Also, the overall transformation of the crystals from the reactant to the product state via a transient structure with a picosecond lifetime has been found by time-resolved x-ray diffraction, and by the time-correlated single-photon counting measurements.
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