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VOLUME 58 (1993) | ISSUE 2 | PAGE 134
Ultrafast relaxation of photoinduced darkening in a fullerite
The mechanisms for excitation and energy relaxation of charge carriers over times ~ 100 fs in a Οω film have been studied by femtosecond laser spectroscopy. The absorption was studied as a function of the laser beam intensity. An increase in the absorption, with a peak at vanishingly small delay times, gives way to an electronic-vibrational relaxation with time scales Tj~ 1 ps and r2~ 30 ps.