Ultrafast relaxation of photoinduced darkening in a fullerite
Kardash I. E. , Letokhov V. S. , Lozovik Yu. E., Matveets Yu. A. , Stepanov A. G. , Farztdinov V. M.
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.