300 400 500

Wavelength (nm)

Fig. 9.13. Variation of the ultraviolet-visible optical ab-sorbance of a C60 film initially 3200 Â thick deposited on a quartz substrate. The film was plasma etched with CF4 for the time durations indicated in the legend, thereby thinning the film and reducing its ab-sorbance, while retaining the spectral features [9.32],

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