In the present work, Raman spectra of alkane gases aqueous solution under simulated deep-sea hydrothermal environment were acquired by high temperature and high pressure deep-sea simulation experiment system. The variation laws of the Rsman spectral features with various temperature and pressure were analyzed and mathematical model between them were established. The results show that for all Raman peaks of these alkane gases in aqueous solution the frequency is lower than gaseous state because of hydrogen bond; the variations of their Raman spectrum were not obvious as the pressure increased (≤40 MPa)in room temperature; and all peak positions move to lower wave number and their full width at half maximum (FWHM) increased along with changing temperature in the range of room temperature to 350 ℃ at 40 MPa pressure. The results provide an experimental basis for the in-situ detection of deep sea by Raman laser spectroscopy system in hydrothermal environment.%利用高温高压深海模拟实验系统,进行了深海热液环境下烷类气体水溶液的拉曼光谱探测,分析了烷类分子的拉曼特征峰随温度和压力的变化规律,建立了温度与光谱之间的数学模型.结果表明:由于水的氢键作用,导致溶于其中的烷类分子的拉曼特征峰频移量较其气态时减小;常温下,在≤40 MPa 压力范围内,烷类分子的拉曼特征峰均未见明显变化;在40 MPa 的压力下,随着温度的升高(≤350℃),各拉曼特征峰的峰位均发生红移,谱线半高宽度(FMHW)均增加.该实验结果为利用激光拉曼光谱技术进行实时、原位热液区化学成分探测提供了实验基础.
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