当用窄带宽的激光时，该技术对里德堡能级的窄光谱结构可以获得消多普勒的分辨率。
Two-photon resonant NFWM is a Doppler-free spectroscopy by using the narrow bandwidth of incident laser beams.
计算结果表明：金、银两种材料的纳米粒子，其消光光谱的强度和峰位存在一定的差异。
The results showed that the peak place and the strength of the extinction spectra of the nanoparticles with different material were distinct.
采用小波变换消噪技术首次应用到中药二维相关红外光谱的数据处理中。
Wavelet analysis and wavelet denoising was applied to analyse the data of two dimensional correlation ir spectroscopy of traditional Chinese medicine for the first time in this article.
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