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- W2070347165 abstract "The results of time-dependent density functional theory (TDDFT) calculations of resonance Raman intensities are combined with experimental deep-ultraviolet resonance Raman measurements at a single wavelength, i.e., 244 nm, in order to test the possibility to distinguish several very similar compounds. Pyrene and three of its substituted derivatives, in which a single hydrogen atom has been replaced by a halogen atom, are compared. The fixed 244 nm excitation wavelength overlapped with the same electronic transition of the four pyrenes. Ground-state calculations using the BP86 exchange-correlation functional were used to predict the Raman frequencies, whereas excited-state calculations have been carried out employing the statistical averaging of (model) orbital potentials (SAOP) potential within a linear-response TDDFT framework in combination with the short-time approximation of resonance Raman intensities. In view of the simplistic theoretical approach, we find a surprisingly good agreement between the simulated and measured resonance Raman spectra of pyrene and its substituted analogues in terms of frequencies and intensities, which shows that the calculations can be used reliably to interpret the experimental spectra. With this combined information, it is possible to find criteria to distinguish the compounds under investigation, although many features of their vibrational spectra are similar." @default.
- W2070347165 created "2016-06-24" @default.
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- W2070347165 date "2005-02-17" @default.
- W2070347165 modified "2023-09-27" @default.
- W2070347165 title "Combined Theoretical and Experimental Deep-UV Resonance Raman Studies of Substituted Pyrenes" @default.
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- W2070347165 doi "https://doi.org/10.1021/jp045360d" @default.
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