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Jungclas H, Komarov VV, Popova AM, Schmidt L, Stureiko IO. Hydrocarbon Substructures of Organic Molecules as Antennas and Amplifiers for External mid-IR Radiation. Z PHYS CHEM 2009. [DOI: 10.1524/zpch.2007.221.8.1075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
We consider organic polyatomic molecules, which contain hydrocarbon antennasi.e.substructures of identical periodically located C–H dipoles. In these antennas collective vibrational excitations (excimols) are coherently produced by resonant absorption of photons in the mid-IR energy range. The energy of an excimol is lower than the energy of the first vibrational excited state of an isolated antenna dipole and the excimol lifetime does not exceed 10-11s. The excimols are excited successively and independently in the C–H dipoles resulting in energy accumulation in the antenna. The accumulated vibrational energy can be transmitted to a trap bond, which is also forming a dipole inside the molecule, however, not acting as an antenna. The trap bond is cleaved, if the absorbed excimol energy is equal to its dissociation energy. Under certain conditions the accumulated energy can be transformed to electronic excitation of a molecular constituent resulting in molecular luminescence. The emitted luminescence photons have energies much higher than the energy of each of the IR photons, which induce an excimol. Thus the hydrocarbon antennas in organic molecules are able to work as amplifiers of external IR radiation. These intramolecular energy transmission processes complete within a time period less or equal to the excimol lifetime and thus can be referred to as super-fast compared to typical time scales calculated by statistical models. The model presented here predicts that the probabilities of the considered processes resonantly depend on the frequency and intensity of IR radiation. The presented theoretical model is supported by the results of our experimental studies of the considered type of molecular fragmentation.
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Stückl AC, Daul CA, Güdel HU. Excited-state energies and distortions of d0 transition metal tetraoxo complexes: A density functional study. J Chem Phys 1997. [DOI: 10.1063/1.474821] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Santos M, Díaz L, Torresano J, Pola J. Visible luminescence study of the infrared multiphoton dissociation of 2-chloroethenylsilane. J Photochem Photobiol A Chem 1997. [DOI: 10.1016/s1010-6030(97)00004-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Pushpa K, Kumar A, Vatsa R, Naik P, Annaji Rao K, Mittal J, Parthasarathy V, Sarkar S. IR and visible luminescence studies in the infrared multiphoton dissociation of 1,2-dibromo-1,1-difluoroethane. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00569-p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Papagiannakopoulos P, Lazarou YG. CO2 laser excitation of triethylsilane: Time resolved luminescence of diethylsilyl radical. INT J CHEM KINET 1994. [DOI: 10.1002/kin.550260807] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Michael C, Lazarou Y, Papagiannakopoulos P. Infrared multiphoton dissociation of tetramethylsilane: formation of electronically excited trimethylsilyl radical. Chem Phys Lett 1992; 194:415-22. [DOI: 10.1016/0009-2614(92)86075-s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Rösch N, Jörg H, Kotzian M. Photofragments of Ni(CO)4: A linear combination of Gaussian‐type orbitals (LCGTO) Xα study. J Chem Phys 1987. [DOI: 10.1063/1.452736] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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