J. Phys. IV France 114 (2004) 115
Multiphoton absorption mechanism of TMTTF, its radical cation and soluble single wall carbon nanotubesM. Meneghetti1, 1, G. Marcolongo1, N. Schiccheri1, M. Garbin1 and E. Menna2
1 Department of Physical Chemistry, University of Padova, Via Loredan 2, 35131 Padova, Italy
2 Department of Organic Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy
Non linear absorption is a non linear optical property which can be observed with large photon intensities and corresponds to instantaneous or sequential absorption of more than one photon. Highly polarisable molecules show high non linear optical activity and in the following it will be presented the multiphoton absorption properties of tetramethyltetratiafulvalene (TMTTF), its radical cation and pristine and soluble single wall carbon nanotubes (SWNT). One finds that excited two photon absorptions are active for nanosecond laser pulses at 532 nm with very large absorption cross sections. Key words. Non linear optics, non linear absorption, TMTTF, SWNT.
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