Population pumping of excited vibrational states by spontaneous surface-enhanced Raman scattering
Population pumping of excited vibrational states by spontaneous surface-enhanced Raman scattering
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DOI：
10.1103/physrevlett.76.2444
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发表时间：
1996-04-01
影响因子：
8.6
通讯作者：
Feld, MS
中科院分区：
文献类型：
--
作者：
Kneipp, K;Wang, Y;Feld, MS
通过自发表面增强拉曼散射（Sers），我们观察到基态粒子数向第一激发振动态的显著转移，这可以用出乎意料的大Sers截面来解释。这种泵浦的证据包括（i）超过从玻尔兹曼分布预期的反斯托克斯与斯托克斯比，（ii）反斯托克斯信号对激发强度的二次依赖性，而斯托克斯信号保持线性依赖性，以及（iii）Sers斯托克斯信号中nu = 1到nu = 2拉曼跃迁的分量。
We observed significant transfer of ground state population to the first excited vibrational state by spontaneous surface-enhanced Raman scattering (SERS) which can be explained by unexpectedly large SERS cross sections. Evidence for this pumping includes (i) anti-Stokes to Stokes ratios which exceed those expected from a Boltzmann distribution, (ii) a quadratic dependence of the anti-Stokes signal on the excitation intensity, whereas the Stokes signal remains linearly dependent, and (iii) a component of nu = 1 to nu = 2 Raman transitions in the SERS Stokes signals.