付立叶变换、光纤拉曼光谱研究大分子

Liquid-core optical is used inmeasurements of Fourier transform Raman spectra, obtaining the good quality Raman spectra and enhancing the Raman spectra intensity 102-103 times.The minimal length of optical fiber, which yields the maximal intensity of Raman spectra, can obtained by making the reciprocal of the loss coefficient of optical fiber.Using the technique, we observed 1520cm-1 and 1524cm-1 Raman lines that rise from transition assighed to C=C vibration of β-carotene and Rhodamine in CS2. We found the 1520cm-1 and 1524cm-1 lines change as the concentration lower (10-7-10-12mol/L) frequency shift to long wave (red shift ), linewidth becomes narrow and molar gain ceofficient enhances.This combination techniquie of liquid-core optical fiber and Fourier transform Raman spectrum has potential applications,for example,study on single molecular structure,biologic process and super trace analysis etc.

利用液芯光纤技术，可以提高拉曼强度。将该技术与付立叶变换光谱技术结合起来，可以获得高分辨、高灵敏度的拉曼光谱。研究获得最佳光谱时，光纤及光学系统中物理、化学参数之间关系；解决相关技术。探测溶剂对大分子结构的影响，可以获得液体中大分子丰富信息、了解真实情况。该技术是研究液体中大分子有力手段，是一种新实验方法。