Absolute measurement of the optical polarizability of C60

We report on a new optical technique that uses light forces and a time-of-flight spectrometer to make absolute measurements of cluster polarizabilities. This is also the first accurate report of an ac polarizability measurement of a condensable cluster in the gas phase. We have determined the optical polarizability of C60 at the fundamental wavelength of a Nd:YAG laser (1.064 μm) to be α=79±4 Å3.

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