Abstract

Abstract The picosecond transient absorption spectrum of C 60 in toluene was obtained in the region 420-1100 nm and a new transient absorption band near 1000 nm was discovered. This band was attributed to the S 1 —S x transition, probably between configurations (h u ) 9 (t 1g ) 1 ← (h u ) 9 (t 1u ) 1 . The intersystem crossing time τ= 830±190 ps was estimated from the S 1 —S x absorption decay and from the creation of the T 1 -T x absorption band.

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