Journal
JOURNAL OF COMPUTATIONAL CHEMISTRY
Volume 29, Issue 10, Pages 1650-1655Publisher
WILEY
DOI: 10.1002/jcc.20934
Keywords
local molecular orbital; coupled cluster; conjugated polymer; polarizability; linear scaling
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Electron correlation effect in conjugated polymer is a long-standing problem, especially for the nonlinear optical properties. We have implemented a spin-adapted Coupled Cluster with singles and doubles excitation with local molecular orbital approach. As a first application, we evaluate the static polarizability of conjugated polyene chains with finite field approach. It is found that the local molecular orbital approach can tremendously reduce the computational costs at sufficiently high accuracy. It is also found that the electron correlation can largely reduce the molecular polarizability with respect to the Hartree-Fock mean field results. (C) 2008 Wiley Periodicals, Inc.
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