Excited-state absorption cross-section of C60

Nansheng Tang; H. Guan; Jouni P. Partanen; Robert W. Hellwarth

doi:10.1117/12.173827

15 May 1994 Excited-state absorption cross-section of C60

Nansheng Tang, H. Guan, Jouni P. Partanen, Robert W. Hellwarth

Proceedings Volume 2143, Organic, Metallo-Organic, and Polymeric Materials for Nonlinear Optical Applications; (1994) https://doi.org/10.1117/12.173827
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We use a pump-probe technique to measure the change in optical transmission through a 1 cm C₆₀/benzene (0.58 g/l) solution caused by a 532 nm 25 ps `pump' pulse having fluence up to approximately 10 mJ/cm². Temporal dependence indicates that transmission drops within the pump pulse width and stays at the reduced level up to our maximum delay time (approximately 10 ns). If we use the standard three-level model for the C₆₀ molecule we deduce that either the excited-singlet-to-triplet crossing happens faster than our pulse width or the two states have indistinguishable absorption cross-sections ((sigma) _S approximately equals (sigma) _T) at our laser wavelength. We believe that the latter assumption is more probable, and interpret our data by a simple two-cross-section ((sigma) _O, (sigma) _T) model. We find that the difference (sigma) _T - (sigma) _O is (3.5 +/- 0.2) X 10^-17 cm². We measure the ground state absorption cross-section (sigma) _O to be (3.5 +/- 0.3) X 10^-18 cm² in an independent experiment.

Citation Download Citation

Nansheng Tang, H. Guan, Jouni P. Partanen, and Robert W. Hellwarth "Excited-state absorption cross-section of C60", Proc. SPIE 2143, Organic, Metallo-Organic, and Polymeric Materials for Nonlinear Optical Applications, (15 May 1994); https://doi.org/10.1117/12.173827

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