Femtosecond resolved fluorescence studies of molecular processes and ultrafast photochemistry in solution
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedad Mexicana de Física A.C.
2010
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| _version_ | 1876467535423995904 |
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| author | J. Peon |
| author_facet | J. Peon |
| contents | Femtosecond resolved fluorescence studies of molecular processes and ultrafast photochemistry in solution J. Peon Física, Astronomía y Matemáticas up Time conversion resolved fluorescence excited state dynamics The evolution of electronically excited states in aromatic compounds can be studied by resolving the spontaneous molecular emission through sum-frequency mixing techniques with femtosecond time resolution. In this communication, a brief review of the experimental technique is presented, together with two examples of its use to investigate photochemical and photophysical pathways in organic compounds. In the study of the ultrafast photophysics of nitrated polycyclic aromatic hydrocarbons, the up-conversion technique allowed the first direct observation of the singlet excited states of these substances. The measurements revealed that the intersystem crossing channel in nitroaromatics determines an S1 lifetime which can be as short as a few tens of femtoseconds due to the existence of upper states which act as receiver states in the triplet manifold. In a second example, we show a study of the mechanism of the transfer of a proton from a hydroxylic oxygen atom to a nitrogen atom in fluorescent Schiff bases. These experiments were able to detect the locally excited enol state as the system transits towards the cis-keto conformation through a barrierless reaction coordinate. 2010 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57030352003 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.56 |
| format | Artículo científico |
| id | redalyc_57030352003 |
| institution | Redalyc |
| language | en |
| publishDate | 2010 |
| publisher | Sociedad Mexicana de Física A.C. |
| spellingShingle | Femtosecond resolved fluorescence studies of molecular processes and ultrafast photochemistry in solution J. Peon Física, Astronomía y Matemáticas up Time conversion resolved fluorescence excited state dynamics Femtosecond resolved fluorescence studies of molecular processes and ultrafast photochemistry in solution J. Peon Física, Astronomía y Matemáticas up Time conversion resolved fluorescence excited state dynamics The evolution of electronically excited states in aromatic compounds can be studied by resolving the spontaneous molecular emission through sum-frequency mixing techniques with femtosecond time resolution. In this communication, a brief review of the experimental technique is presented, together with two examples of its use to investigate photochemical and photophysical pathways in organic compounds. In the study of the ultrafast photophysics of nitrated polycyclic aromatic hydrocarbons, the up-conversion technique allowed the first direct observation of the singlet excited states of these substances. The measurements revealed that the intersystem crossing channel in nitroaromatics determines an S1 lifetime which can be as short as a few tens of femtoseconds due to the existence of upper states which act as receiver states in the triplet manifold. In a second example, we show a study of the mechanism of the transfer of a proton from a hydroxylic oxygen atom to a nitrogen atom in fluorescent Schiff bases. These experiments were able to detect the locally excited enol state as the system transits towards the cis-keto conformation through a barrierless reaction coordinate. 2010 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57030352003 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.56 |
| title | Femtosecond resolved fluorescence studies of molecular processes and ultrafast photochemistry in solution |
| topic | Física, Astronomía y Matemáticas up Time conversion resolved fluorescence excited state dynamics |
| url | https://www.redalyc.org/articulo.oa?id=57030352003 |