Anomalous Raman scattering from the surface of conjugated polymer melts - art. no. 144209

Authors
Liem, H Etchegoin, P Bradley, DDC
Citation
H. Liem et al., Anomalous Raman scattering from the surface of conjugated polymer melts - art. no. 144209, PHYS REV B, 6414(14), 2001, pp. 4209
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6414
Issue
14
Year of publication
2001
Database
ISI
SICI code
0163-1829(20011001)6414:14<4209:ARSFTS>2.0.ZU;2-1
Abstract
Confocal Raman spectroscopy from the surface of a polymer melt is shown to produce anomalous results for polarized Raman scattering of specific molecu lar vibrations. Values of the depolarization ratio that cannot exist in nor mal liquids are interpreted as due to surface-induced molecular orientation of the polymer chains. The technique provides one of the few direct experi mental evidences of molecular-orientation effects predicted in lattice mode ls of polymer melts.