Abstract
The harmonics of free electron laser (FEL) were irradiated to the surfaces of compressed C60 and/or mixture of C60 and I2 in the vacuum. After the irradiation of FEL with the typical wavelength, 450 nm or 345 nm, the Raman peak of Ag(2)-derived vibration mode of C60 shifted to the lower energy side. This result suggested that polymerization reactions of C60 proceeded. The largest peak shift, ca. 10 cm−1 was obtained in the mixture powder irradiated by 345 nm irradiation. The decrease of the lattice parameter was confirmed by XRD analyses revealed that inter-molecular combinations took places. Furthermore the change of the crystal structure was closely studied by changing the wavelength of FEL in the range of 350–600 nm. The obtained results demonstrated that three-dimensional polymerization of C60 was effectively promoted by FEL irradiation and/or especially the effect of the photon-assisted hole-doping from iodine atoms to C60 molecules.
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