2011
DOI: 10.1039/c0cp02221g
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Spectroscopy and dynamics of methyl-4-hydroxycinnamate: the influence of isotopic substitution and water complexation

Abstract: High-resolution Resonance Enhanced MultiPhoton Ionization (REMPI) and Laser Induced Fluorescence (LIF) excitation spectra of jet-cooled methyl-4-hydroxycinnamate, methyl-4-OD-cinnamate, and of their water clusters have been recorded. Whereas water complexation leads to significant linewidth narrowing, isotopic substitution does for all practical purposes not influence the excited-state dynamics. In this light, we evaluate two previously proposed decay channels of the photoexcited ππ* state involving the dissoc… Show more

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Cited by 21 publications
(55 citation statements)
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“…Indeed, comparison of the line widths in the LIF spectrum with the line widths in the one-colour RE2PI spectrum gave in the past reason to believe that it is hard to avoid partial saturation in one-colour RE2PI. 28 As will be argued below, the observation that the two-colour signal is much stronger than the one-colour signal provides direct evidence for the conclusion that the electronic state that is excited is not the same state from which ionization takes place.…”
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confidence: 92%
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“…Indeed, comparison of the line widths in the LIF spectrum with the line widths in the one-colour RE2PI spectrum gave in the past reason to believe that it is hard to avoid partial saturation in one-colour RE2PI. 28 As will be argued below, the observation that the two-colour signal is much stronger than the one-colour signal provides direct evidence for the conclusion that the electronic state that is excited is not the same state from which ionization takes place.…”
mentioning
confidence: 92%
“…In the rst instance one might suspect that this is due to the decrease of the ionization energy of the cluster compared to the bare molecule (0.442 eV), 28 which could lead to a more efficient ionization of the np* state in the cluster. However, experiments in which the decay of the REMPI signal is monitored as a function of the delay between excitation and ionization show a signal that follows the convolution of the time proles of the two lasers and does not give any indication of a long-living state.…”
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confidence: 99%
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