期刊
CHEMICAL PHYSICS LETTERS
卷 331, 期 5-6, 页码 561-568出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(00)01009-5
关键词
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The collective electronic oscillators (CEO) approach based on the TDHF approximation is combined with INDO/S, MNDO, AMI, and PM3 semiempirical Hamiltonians. This technique is applied to compute and analyze the electronic structure of acceptor-substituted oligomers and conjugated polymers. Calculated excited-state energies and oscillator strengths agree well with the experimental data and with each other. In particular, the results using the Hamiltonians parameterized for ground-state calculations such as AMI and PM3 agree well with the INDO/S results. In addition, a two-dimensional analysis of the corresponding transition density matrices provides an efficient way for tracing the origin of various optical transitions by identifying the underlying changes in charge densities and bond-orders. (C) 2000 Elsevier Science B.V. All rights reserved.
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