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以气相甲烷分子ν1模Q支的拉曼光谱为例,采用拉曼诱导克尔效应谱(RIKES)进行峰形测量,并将其与同时测量的受激拉曼光声光谱(PARS)的峰形进行了比较.结果表明,在pump光和Stokes光均为线偏振的情况下,两者存在着差异;在拉曼共振峰的低频端,RIKES谱强度略高;而高频端则恰好相反.从信号产生机制出发,对此进行了合理解释.
关键词:
拉曼诱导克尔效应谱
受激拉曼光声光谱
峰形 相似文献
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Here, we study a low (less than 0.1 µg/ml) concentration aqueous suspension of single‐wall carbon nanotubes (SWNTs) by Raman‐induced Kerr effect spectroscopy (RIKES) in the spectral bands 0.1–10 and 100–250 cm−1. This method is capable of carrying out direct investigation of SWNT hydration layers. A comparison of RIKES spectra of SWNT aqueous suspension and that of milli‐Q water shows a considerable growth in the intensity of low wavenumber Raman modes. These modes in the 0.1–10 cm−1 range are attributed to the rotational transitions of H2O2 and H2O molecules. We explain the observed intensity increase as due to the production of hydrogen peroxide and the formation of a low‐density depletion layer on the water–nanotube interface. A few SWNT radial breathing modes (RBM)are observed (ωRBM = 118.5, 164.7 and 233.5 cm−1) in aqueous suspension, which allows us to estimate the SWNT diameters (∼2.0, 1.5, and 1 nm, respectively). Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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