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142 results on '"Fuciman, Marcel"'

20. A Series of Ultra-Efficient Blue Borane Fluorophores

Author

Bould, Jonathan, primary, Lang, Kamil, additional, Kirakci, Kaplan, additional, Cerdán, Luis, additional, Roca-Sanjuán, Daniel, additional, Francés-Monerris, Antonio, additional, Clegg, William, additional, Waddell, Paul G., additional, Fuciman, Marcel, additional, Polívka, Tomáš, additional, and Londesborough, Michael G. S., additional

Published
2020
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23. Unveiling the role of upper excited electronic states in the photochemistry and laser performance of anti-B18H22.

Author

Cerdán, Luis, Francés-Monerris, Antonio, Roca-Sanjuán, Daniel, Bould, Jonathan, Dolanský, Jiří, Fuciman, Marcel, and Londesborough, Michael G. S.

Abstract

In the search for innovative new light sources, the discovery that solutions of the boron hydride anti-B18H22 generate photostable blue laser emission stands out in its significance as the first laser borane. Surprisingly, though, the laser performance of anti-B18H22 (∼10% efficiency) does not match the expectations based on its exceptional photophysical properties (Φf = 0.97 and high photostability). To understand this contradiction, we herein present an investigation into the upper excited states of the anti-B18H22 photophysical system, which we suggest to be the most relevant factor to its laser performance. The use of computational quantum chemistry, laser and UV-vis spectroscopy, NMR spectroscopy, and mass spectrometry unveil the role of the upper excited states on the laser performance of anti-B18H22, showing that efficient excited state absorption (ESA) leads to the population of these states, and results not only in the loss of laser efficiency, but also in the activation of chemically reactive relaxation pathways and the formation of photochemically produced novel molecular species. The likely composition of these photoproducts, formed upon prolonged high intensity laser irradiation, is inferred from their molecular masses, NMR properties, and calculated natural orbitals. Together, these results are of key importance to the complete understanding of the anti-B18H22 photophysical system and provide valuable information to chemists and laser physicists working to mitigate deficiencies and enhance the performance of the next generation of borane lasers and borane-based photoactive materials. [ABSTRACT FROM AUTHOR]

Published
2020
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26. The intramolecular charge transfer state in carbonyl-containing polyenes and carotenoids

Author

Enriquez, Miriam M., Fuciman, Marcel, LaFountain, Amy M., Wagner, Nicole L., Birge, Robert R., and Frank, Harry A.

Subjects
Carbonyl compounds -- Structure, Carbonyl compounds -- Chemical properties, Carbonyl compounds -- Electric properties, Carotenoids -- Structure, Carotenoids -- Chemical properties, Carotenoids -- Electric properties, Charge transfer -- Analysis, Excited state chemistry -- Analysis, Molecular dynamics -- Usage, Polyenes -- Structure, Polyenes -- Chemical properties, Solvation -- Analysis, Chemicals, plastics and rubber industries
Published
2010

35. Equilibration Dependence of Fucoxanthin S1and ICT Signatures on Polarity, Proticity, and Temperature by Multipulse Femtosecond Absorption Spectroscopy

Author

West, Robert G., Fuciman, Marcel, Staleva-Musto, Hristina, Šebelík, Václav, Bína, David, Durchan, Milan, Kuznetsova, Valentyna, and Polívka, Tomáš

Abstract

To demonstrate the value of the multipulse method in revealing the nature of coupling between excited states and explore the environmental dependencies of lowest excited singlet state (S1) and intramolecular charge transfer (ICT) state equilibration, we performed ultrafast transient absorption pump–dump–probe and pump–repump–probe spectroscopies on fucoxanthin in various solvent conditions. The effects of polarity, proticity, and temperature were tested in solvents methanol at 293 and 190 K, acetonitrile, and isopropanol. We show that manipulation of the kinetic traces can produce one trace reflecting the equilibration kinetics of the states, which reveals that lower polarity, proticity, and temperature delay S1/ICT equilibration. On the basis of a two-state model representing the S1and ICT states on the same S1/ICT potential energy surface, we were able to show that the kinetics are strictly dependent on the initial relative populations of the states as well as the decay of the ICT state to the ground state. Informed by global analysis, a systematic method for target analysis based on this model allowed us to quantify the population transfer rates throughout the life of the S1/ICT state as well as separate the S1and ICT spectral signatures. The results are consistent with the concept that the S1and ICT states are part of one potential energy surface.

Published
2018
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47. Excited state properties of aryl carotenoids

Author

Fuciman, Marcel, primary, Chábera, Pavel, additional, Župčanová, Anita, additional, Hříbek, Petr, additional, Arellano, Juan B., additional, Vácha, František, additional, Pšenčík, Jakub, additional, and Polívka, Tomáš, additional

Published
2010
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