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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4381

Title: Large-scale correlated study of excited state absorptions in naphthalene and anthracene
Authors: SONY, P
SHUKLA, A
Keywords: dipole-forbidden transitions
lying singlet-states
2-photon spectroscopy
conjugated polymers
polyacenes
spectra
polyacetylenes
acenaphthene
electronics
transistors
Issue Date: 2009
Publisher: AMER INST PHYSICS
Citation: JOURNAL OF CHEMICAL PHYSICS, 131(1), -
Abstract: In this paper, we report theoretical calculations of the photoinduced absorption (PA) spectrum of naphthalene and anthracene, with the aim of understanding those excited states, which are invisible in the linear optical absorption. The excited state absorption spectra are computed from the 1B(2u)(+) and the 1B(3u)(+) states and a detailed analysis of the many-body character of the states contributing to various peaks in the spectra is presented. The calculations are performed using the Pariser-Parr-Pople (PPP) Hamiltonian, along with the full configuration interaction technique. The role of Coulomb parameters used in the PPP Hamiltonian is examined by considering standard Ohno parameters, as well as a screened set of parameters. The results of our calculations are extensively compared with the experimental data where available and very good agreement has been obtained. Moreover, our calculations predict the presence of high intensity features which, to the best of our knowledge, have not been explored earlier. We also present concrete predictions on the polarization properties of the PA spectrum, which can be verified in experiments performed on oriented samples.
URI: http://dx.doi.org/10.1063/1.3159670
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4381
http://hdl.handle.net/10054/4381
ISSN: 0021-9606
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