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- W289275422 abstract "Ultrafast vibrational dynamics of documentclass[12pt]{minimal}begin{document}${rm BH}_4^-$end{document} BH 4− ions, the key units in boron hydride materials for hydrogen storage, are studied in diluted polar liquid solution and in NaBH4 crystallites by femtosecond infrared spectroscopy. Two-color pump-probe experiments reveal v = 1 lifetimes of 3 ps for the asymmetric documentclass[12pt]{minimal}begin{document}${rm BH}_4^-$end{document} BH 4− stretching mode ν3 and of 3.6 ps for the asymmetric bending mode ν4 in the solvent isopropylamine. We provide direct evidence for the documentclass[12pt]{minimal}begin{document}${rm BH}_4^-$end{document} BH 4− stretching relaxation pathway via the asymmetric bending mode ν4 by probing the latter after femtosecond excitation of ν3. Pump-probe traces measured in the crystalline phase show signatures of radiative coupling between the densely packed documentclass[12pt]{minimal}begin{document}${rm BH}_4^-$end{document} BH 4− oscillators, most clearly manifested in an accelerated subpicosecond depopulation of the v = 1 state of the ν4 mode. The radiative decay is followed by incoherent vibrational relaxation similar to the liquid phase. The excess energy released in the relaxation processes of the documentclass[12pt]{minimal}begin{document}${rm BH}_4^-$end{document} BH 4− intramolecular modes is transferred into the environment with thermal pump-probe signals being much more pronounced in the dense solid than in the diluted solution." @default.
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- W289275422 date "2014-07-17" @default.
- W289275422 modified "2023-10-18" @default.
- W289275422 title "Ultrafast vibrational dynamics of BH 4− ions in liquid and crystalline environments" @default.
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- W289275422 doi "https://doi.org/10.1063/1.4889743" @default.
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