26 ℃和常压至1.5 GPa压力下2-甲基戊烷拉曼光谱研究

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摘要：利用碳化硅压腔在常压至1.5 GPa和26 ℃条件下对液态2-甲基戊烷进行了拉曼光谱测量，讨论了C—H拉曼峰频率、强度、面积、以及谱峰宽度随压力升高的变化规律。实验结果表明，2-甲基戊烷的拉曼位移在2 800～30 00 cm^-1范围内的CH₃和CH₂的伸缩振动谱峰随着压力的增大均连续向高波数位移，其拉曼位移与压力的关系可以表示为ν_as(CH₃)=0.013 1p+2 960.1，ν_s(CH₃)=0.008 8p+2 871.0，ν_as(CH₂)=0.008 9p+2 930.2，ν_as(CH₂)’=0.007 0p+2 903.1和ν_s(CH₂)=0.007 9p+2 844.7。另外处理实验结果时发现，在0～1.5 GPa条件下，2-甲基戊烷的ν_as(CH₃)拉曼位移可以进行压力标定，其方程为：P(MPa)=76.2(Δν_p)_{2 960}+21.65(r²=0.995 8)。该压力体标定剂，适合于不希望有Si和Al等元素出现的体系。

关键词：2-甲基戊烷;拉曼位移;碳化硅;金刚石压腔(DAC);压力标定剂;高压

Abstract：The present paper investigates the Raman spectral character of liquid 2-methylpentane by an experiment at the pressure of 0-1.5 GPa and the temperature of 26 ℃, and defines the relation between the pressure and the Raman peak of 2-methylpentane at ambient temperature. The result shows that there are five characteristic Raman peaks in 2-methylpentane defined as ν(CH₂) and ν(CH₃), and all of them move to high position as the system pressure increases. The relation between the system pressure and peaks positions is given as following: ν_as(CH₃)=0.013 1p+2 960.1, ν_s(CH₃)=0.008 8p+2 871.0, ν_as(CH₂)=0.008 9p+2 930.2, ν_as(CH₂)’=0.007 0p+2 903 and ν_s(CH₂)=0.007 9p+2 844.7. On the other hand, 2-methylpentane is reliable as a liquid pressure gauge for high pressure experiment. The equation applied to demarcate system pressure is also showed: p(MPa)=76.2(Δν_p)2 960+21.65(r²=0.995 8). This is probably the first organic liquid gauge, especially for systems not expected to emergence of Si, Al and hydroxyl matter.

Key words：2-Methylpentane;Raman spectra;Moissanite;DAC;Pressure gauge;High-pressure

收稿日期: 2006-05-10 修订日期: 2006-08-20

中图分类号:

O657.3

通讯作者: 郑海飞 E-mail: hfzheng@pku.edu.cn

引用本文:

刘俊杰,郑海飞^*. 26 ℃和常压至1.5 GPa压力下2-甲基戊烷拉曼光谱研究[J]. 光谱学与光谱分析, 2007, 27(11): 2254-2257.
LIU Jun-jie,ZHENG Hai-fei^*. Research on Raman Spectra of 2-Methylpentaneat at Pressure of 0-1.5 GPa and Temperature of 26 ℃. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(11): 2254-2257.

链接本文:

https://www.gpxygpfx.com/CN/Y2007/V27/I11/2254

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