溶剂折射率对β-胡萝卜素拉曼散射截面的影响

以环己烷的1444 cm^-1拉曼线为内标，采用5145 nm激发光分别测量了β-胡萝卜素的C=C双键（1520 cm^-1）和C—C单键（1155 cm^-1）振动模式下在不同折射率溶剂中的拉曼散射截面，结果表明随溶剂的折射率增加β-胡萝卜素在两种振动模式下拉曼散射截面都增加.利用色散力和共振拉曼理论解释了在不同折射率溶剂中β-胡萝卜素散射截面的差异. 关键词： 拉曼散射截面 β-胡萝卜素 色散力 共振拉曼

Effect of solvent refractive index on Raman cross-section of β-carotene

The Raman cross-sections of β-carotene C=C double bond （1520 cm^－1） and C—C single bond（1155 cm^－1） vibration mode have been measured using cyclohexane as internal standard. The result shows that the Raman cross-section of β-carotene increases with the increase of refractive indexes of solvents. The difference of β-carotene Raman cross-section in different refractive indexes of solvents was explained by the dispersion and resonance Raman theory.