A conclusive demonstration of vibrational pumping under surface enhanced Raman scattering conditions

Article Abstract:

A new method is proposed which allows measurement of the cross sections for different modes and also provides the determination of the asymmetry between the anti-Stokes and Stokes Surface Enhanced Raman Scattering (SERS) cross sections for each mode. A conclusive demonstration is provided of vibrational pumping under SERS conditions by performing anti-Stokes/Stokes ratio measurements over a large spatial area and low power density, down to 10K with dried silver colloids, the dye rhodamine 6G and 676nm laser excitation.

Analysis, Excited state chemistry, Atomic properties, Colloidal silver

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On the experimental estimation of surface enhanced Raman scattering (SERS) cross sections by vibrational pumping

Article Abstract:

An in-depth analysis of the experimental estimation of cross-sections in surface enhanced Raman scattering (SERS) by vibrational pumping is presented. Despite the approximations needed and the intrinsic problems of the technique, it was found to be excellent tool to extract an estimation of the SERS cross-sections in situations where the number of molecules and hot-spots present in the sample are not known or are difficult to estimate.

Observations, Vibrational spectra

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Self-limiting aggregation leads to long-lived metastable clusters in colloidal solutions

Article Abstract:

The existence of a metastable state with limited Coulomb-blocked aggregation at the onset of instability in a colloidal solution is proposed and demonstrated both experimentally and theoretically. The stability of the partially aggregated phase should provide solutions with long-term usability, where reproducibility and statistical analysis can be performed with increased confidence and better control.

Monte Carlo method, Monte Carlo methods, Electrostatic interactions, Colloid chemistry, Coulomb excitation

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