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• W2324062507 abstract "We present a theoretical analysis of the electronic absorption spectra of tetracene in 4He droplets based on many-body quantum simulations. Using the path integral ground state approach, we calculate one- and two-body reduced density matrices of the most strongly localized He atoms near the molecule surface and use these to investigate the helium ground-state quantum coherence and correlations when tetracene is in its electronic ground and excited states. We identify a trio of quasi-one-dimensional, strongly localized atoms adsorbed along the long axis of the molecule that show some quantum coherence among themselves but far less with the remaining solvating helium. We evaluate the single-particle natural orbitals of the localized He atoms by diagonalization of the one-body density matrix and use these to construct single- and many-particle solvating helium basis states with which the zero-phonon spectral features of the tetracene–4HeN absorption spectrum are then calculated. The absorption spectrum resulting from the three-body density matrix for the strongly bound trio of helium atoms is in very good agreement with the experimental data, accounting quantitatively for the anomalous splitting of the zero-phonon line [Hartmann, M.; Lindinger, A.; Toennies, J. P.; Vilesov, A. F.Chem. Phys. 1998, 239, 139; Krasnokutski, S.; Rouillé, G.; Huisken, F.Chem. Phys. Lett. 2005, 406, 386]. Our results indicate that the combination of strong localization and the quasi-one-dimensional nature of trios of helium atoms adsorbed along the long axis of tetracene leads to a quantum coherent, yet highly correlated ground state for the helium density closest to the molecule. The spectroscopic analysis shows that this feature accounts quantitatively for the anomalous splittings and hitherto unexplained fine structure observed in the absorption spectra of tetracene and suggests that it may be responsible for the corresponding zero-phonon splittings in other quasi-one-dimensional planar aromatic molecules." @default.
• W2324062507 created "2016-06-24" @default.
• W2324062507 creator A5018524253 @default.
• W2324062507 creator A5019265176 @default.
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• W2324062507 date "2011-06-08" @default.
• W2324062507 modified "2023-09-23" @default.
• W2324062507 title "Theoretical Analysis of the Anomalous Spectral Splitting of Tetracene in ⁴He Droplets" @default.
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• W2324062507 doi "https://doi.org/10.1021/jp2003003" @default.
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