用 SERS 定量共振拉曼截面。

Quantifying resonant Raman cross sections with SERS.

机构信息

The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.

出版信息

J Phys Chem A. 2010 May 6;114(17):5515-9. doi: 10.1021/jp100669q.

DOI:10.1021/jp100669q

PMID:20377210

Abstract

We propose a method based on surface-enhanced Raman scattering (SERS) to estimate the resonance Raman cross sections of dyes. The latter are notoriously difficult (or impossible) to obtain by normal (spontaneous) constant wave Raman spectroscopy when the fluorescence quantum yield of the molecules is good and the overwhelming effect of fluorescence masks the Raman spectrum. We propose here to use the fluorescence quenching occurring in SERS conditions to overcome simply this problem. The principles of the method are described and its limitations discussed in detail. The method is demonstrated by estimating the resonance Raman differential cross sections for Rhodamine 6G for seven different excitation wavelengths across the visible range.

摘要

我们提出了一种基于表面增强拉曼散射（SERS）的方法来估算染料的共振拉曼截面。当分子的荧光量子产率良好且荧光的压倒性影响掩盖了拉曼光谱时，通过普通（自发）恒波拉曼光谱很难（或不可能）获得后者。我们在这里建议使用 SERS 条件下发生的荧光猝灭来简单地克服这个问题。本文详细描述了该方法的原理，并讨论了其局限性。通过估算 Rhodamine 6G 在可见范围内的七个不同激发波长的共振拉曼差分截面，验证了该方法。