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Abstract: We report on the observation of the natural isotopic spread of carbon fromsingle-molecule Surface Enhanced Raman Spectroscopy SM-SERS. By choosing adye molecule with a very localized Raman active vibration in a cyano bondC$\equiv$N triple bond, we observe in a SERS colloidal liquid a smallfraction of SM-SERS events where the frequency of the cyano mode is softenedand in agreement with the effect of substituting $^{12}$C by the next mostabundant $^{13}$C isotope. This example adds another demonstration of singlemolecule sensitivity in SERS through isotopic editing which is done, in thiscase, not by artificial isotopic editing but rather by nature itself. It alsohighlights SERS as a unique spectroscopic tool, capable of detecting anisotopic change in one atom of a single molecule.



Author: P. G. Etchegoin, E. C. Le Ru, M. Meyer

Source: https://arxiv.org/







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