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Characterization of optical spectra of interacting systems: Application to oxide‐supported metal clusters
Author(s) -
HuixRotllant Miquel,
Deka Ajanta,
Matveev Alexei V.,
Bosko Sergey I.,
Moskaleva Lyudmila V.,
Rösch Notker
Publication year - 2008
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.21853
Subject(s) - time dependent density functional theory , polarizability , chemistry , atomic orbital , cluster (spacecraft) , density functional theory , spectral line , characterization (materials science) , natural bond orbital , polarizable continuum model , molecular physics , chemical physics , atomic physics , computational chemistry , physics , molecule , materials science , nanotechnology , quantum mechanics , solvation , organic chemistry , computer science , programming language , electron
We present a general strategy for interpreting optical spectra of interacting systems on the basis of linear‐response time‐dependent density functional theory (TDDFT) calculations. For this purpose, we combined a natural transition orbitals (NTO) analysis with a fragment molecular orbital (FMO) analysis. The NTO transformation allows one to identify leading contributions of particle‐hole excitations in the spectral bands, whereas the FMO analysis characterizes each pair in terms of (leading) contributions of the corresponding fragments. We applied this procedure to assign and characterize optical transitions of coinage metal dimers M 2 (M = Cu, Ag, Au) adsorbed at regular oxygen sites of MgO(001) as well as at oxygen vacancies, F s and F s + . The TDDFT calculations were carried out at the generalized‐gradient level on structures that had been obtained with cluster models embedded in an elastic polarizable environment. The combined NTO and FMO results allowed us to analyze the spectra both qualitatively and quantitatively. The qualitative results agree very well with a previous assignment carried out by our group (Bosko et al., J Phys Chem A, 2007, 111, 6870), whereas the present approach yields a straightforward and transparent quantitative characterization of the main spectral bands. © 2008 Wiley Periodicals, Inc. Int J Quantum Chem, 2008