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Issue 32, 2007
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Raman jet spectroscopy of formic acid dimers: low frequency vibrational dynamics and beyond

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Abstract

The vibrational dynamics of formic acid dimer is quite regular at low fundamental excitation frequencies, whereas it evolves into a complex and irregular vibrational signature in the OH stretching region. This is evidenced by the first Raman investigation of the jet-cooled formic acid dimer and its three deuterated isotopomers. Subtle isotope effects in the inter-monomer stretching mode, which is directly observed for the first time at 194 cm−1, find an interpretation based on hydrogen bond weakening due to quantum delocalization of the protons. The reported high-frequency jet spectra should provide essential experimental stepping stones towards a more complete understanding of this planar prototype for strong double hydrogen bonding.

Graphical abstract: Raman jet spectroscopy of formic acid dimers: low frequency vibrational dynamics and beyond

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Publication details

The article was received on 23 Apr 2007, accepted on 11 Jun 2007 and first published on 29 Jun 2007


Article type: Paper
DOI: 10.1039/B706094G
Citation: Phys. Chem. Chem. Phys., 2007,9, 4528-4534
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    Raman jet spectroscopy of formic acid dimers: low frequency vibrational dynamics and beyond

    P. Zielke and M. A. Suhm, Phys. Chem. Chem. Phys., 2007, 9, 4528
    DOI: 10.1039/B706094G

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