IDENTIFICATION AND ROLE OF 2-PHOTON-EXCITED STATES IN A PI-CONJUGATEDPOLYMER

Authors
LAWRENCE B TORRUELLAS WE CHA M SUNDHEIMER ML STEGEMAN GI METH J ETEMAD S BAKER G
Citation
B. Lawrence et al., IDENTIFICATION AND ROLE OF 2-PHOTON-EXCITED STATES IN A PI-CONJUGATEDPOLYMER, Physical review letters, 73(4), 1994, pp. 597-600
Citations number
29
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
73
Issue
4
Year of publication
1994
Pages
597 - 600
Database
ISI
SICI code
0031-9007(1994)73:4<597:IARO2S>2.0.ZU;2-9
Abstract
We have measured the full two-photon absorption (TPA) spectrum in the transparency range of single-crystal polydiacetylene paratoluene-sulfo nate (PTS) using z scan. The spectrum consists of three well-defined t wo-photon excited states superimposed on a continuum of even-parity st ates. Comparison of the TPA and the one-photon absorption spectra iden tifies a two-photon accessible state as the lowest excited state of PT S. The accompanying dispersion in the intensity-dependent refractive i ndex coefficient n2 is also reported.