Analytical Sciences

Abstract − Analytical Sciences, 23(7), 769 (2007).

Electron Enhanced Raman Scattering and Its Applications in Solution Chemistry
Hiroharu YUI*,**
*Department of Chemistry, Faculty of Science, Tokyo University of Science, 12 Funagawaramachi, Ichigaya, Shinjyuku, Tokyo 162-0826, Japan
**PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
The present review describes a new enhancement technique for Raman scattering in aqueous solutions. Raman scattering spectroscopy has an inherent ability to distinguish between molecules with great similarity and provides useful information on local physical and chemical environments at their functional groups' level. Since the Raman scattering signals from water molecules are quite weak, Raman spectroscopy has great advantage for detection or discrimination of a trace amount of analytes in aqueous environments. However, Raman scattering cross-sections are inherently small and it generally requires high power excitation and long acquisition times to obtain high-quality Raman spectra. These conditions create disadvantages for the analyses for living cells and real-time monitoring for environmental analyses. Here, I describe a new Raman enhancement technique, namely “electron enhanced Raman scattering (EERS)”, where artificially generated electrons additionally affect the polarizability of target molecular systems and enhance their inherent Raman cross-section. Principles of the EERS and its applications to aqueous solutions are presented.