Excited-state absorption cross-section of C60

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

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

We use a pump-probe technique to measure the change in optical transmission through a 1 cm C 60/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 (σS ≈ σT) at our laser wavelength. We believe that the latter assumption is more probable, and interpret our data by a simple two-cross-section (σ O, σT) model. We find that the difference σT - σO is (3.5 ± 0.2) × 10-17 cm2. We measure the ground state absorption cross-section σ O to be (3.5 ± 0.3) × 10-18 cm2 in an independent experiment.
Original languageEnglish
Pages (from-to)272-280
Number of pages9
JournalSPIE CONFERENCE PROCEEDINGS
Volume2143
DOIs
Publication statusPublished - 15 May 1994
MoE publication typeA1 Journal article-refereed

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