https://doi.org/10.1140/epjb/e2007-00256-6
Anisotropic dynamic response of pentacene single crystals
1
IFW Dresden, Postfach 270116, 01171 Dresden, Germany
2
Institut für Physik, Technische Universität Chemnitz, 09107 Chemnitz, Germany
3
Institute of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
Corresponding author: a m.knupfer@ifw-dresden.de
Received:
14
June
2007
Published online:
28
September
2007
We have investigated the polarization and momentum dependence of singlet excitons in pentacene molecular crystals using inelastic electron scattering. Our results demonstrate that both the direction as well as the absolute value of the momentum are decisive for the spectral intensity of these excitons. Possible implications of this observation for a microscopic understanding of excitons in organic molecular crystals are discussed.
PACS: 78.20.-e – Optical properties of bulk materials and thin films / 71.35.-y – Excitons and related phenomena / 78.30.Jw – Organic compounds, polymers
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007
