溶液浓度对拉曼光谱线宽和频移影响的实验研究

将液芯光纤技术用于傅里叶变换拉曼光谱测量中,提高拉曼光谱强度10²～10⁴倍.应用该技术,在实验上研究了溶液浓度变化对β-carotene,rhodamine在CS²中的CC键π-π^*跃迁拉曼线频移和线宽的影响.实验结果表明,随着浓度降低(1×10^-7～1×10^-12mol/L),拉曼光谱线峰值发生红移,线宽变窄.

Experimental Studies on Effect of Concentration of CS2 on Linewidth and Frequency Shift of Raman Spectrum

Liquid-core optical fiber technique applied in the measurement of Fourier transform Raman spectra, can enhance the Raman spectral intensity about 10²-10⁴ times. Applying this technique, we researched the effect of the variation of the concentrations on the linewidths and frequency shifts of Raman spectral line of β-carotene and rhodamine(in CS₂) in relation to the transition of π-π^* of C=C bond. The experiment results showed that the red shift happens to the peak value of Raman spectral line, linewidth becomes narrow with the decrease of concentration when the concentration studied is 10^-7-10^-12 mol/L.