Evidence of natural isotopic distribution from single-molecule SERS

Autor:	Etchegoin, P. G., Ru, E. C. Le, Meyer, M.
Rok vydání:	2008
Předmět:	Condensed Matter - Soft Condensed Matter Condensed Matter - Other Condensed Matter
Druh dokumentu:	Working Paper
Popis:	We report on the observation of the natural isotopic spread of carbon from single-molecule Surface Enhanced Raman Spectroscopy (SM-SERS). By choosing a dye molecule with a very localized Raman active vibration in a cyano bond (C$\equiv$N triple bond), we observe (in a SERS colloidal liquid) a small fraction of SM-SERS events where the frequency of the cyano mode is softened and in agreement with the effect of substituting $^{12}$C by the next most abundant $^{13}$C isotope. This example adds another demonstration of single molecule sensitivity in SERS through isotopic editing which is done, in this case, not by artificial isotopic editing but rather by nature itself. It also highlights SERS as a unique spectroscopic tool, capable of detecting an isotopic change in one atom of a single molecule. Comment: 4 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0811.0374 Zobrazit plný text záznamu View this record from Arxiv