Two-photon absorption spectrum of poly(fluorene)

Authors
Najechalski, P Morel, Y Stephan, O Baldeck, PL
Citation
P. Najechalski et al., Two-photon absorption spectrum of poly(fluorene), CHEM P LETT, 343(1-2), 2001, pp. 44-48
Citations number
18
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
00092614 → ACNP
Volume
343
Issue
1-2
Year of publication
2001
Pages
44 - 48
Database
ISI
SICI code
0009-2614(20010727)343:1-2<44:TASOP>2.0.ZU;2-F
Abstract
We report here on the two-photon absorption (TPA) properties of poly(fluore ne). The two-photon absorption spectrum has been characterized in the range 550-680 rim. A resonance at lambda = 625 nm is observed with a cross-secti on of 2 x 10(-46) cm(4) s/photon-molecule. This large value is interpreted as the result of dipolar coupling between 12 monomer units, i.e. the polyme r coherence length. In the framework of a three-level model, the TPA transi tion is related to the second excited state 2A(g) lying at 6200 cm(-1) abov e the lowest excited state IBu. (C) 2001 Elsevier Science BN. All rights re served.