A Study of Reversible Photochemical Phenomena in C 60

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Abstract
We report Raman measurements on the photo- induced disassociation via a metastable excited state intermediate of the photoproduct formed from the photochemical degradation of C60. At low intensities, the intrinsic 1468cm−1 C60 mode softens to 1459cm−1 which is stable below an apparent threshold intensity above which it shifts abruptly to 1463cm−1. This mode is stable with increasing intensities. Upon a return to low intensities, the 1468cm−1 intrinsic C60 line reappears. The positioning of the Raman line at 1463cm−1 is associated with an excited state intermediate, observable only at high excitation densities.