Abstract: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 Raman 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.
Key words:Raman spectra;High temperature and high pressure;Methane;Ethane;Propane
[1] White S N,Dunk R M,Peltzer E T,et al. Geochemistry Geophysics Geosystems,2006,7(5):1. [2] Jill D P,Brigitte W J,Freeman J J. Applied Spectroscopy,2004,58(7):195. [3] Fabre D,Oksengorn B. Applied Spectroscopy,1992,46(3):468. [4] LIU Guang-qi,MA Lian-xiang,LIU Jie(刘光启,马连湘,刘 杰). Chemistry and Chemical Properties Data Sheet(化学化工物性数据手册). Beijing:Chemical Industry Press(北京:化学工业出版社),2002. 85. [5] Chapoy A,Mohammadi A H,Richon D,et al. Fluid Phase Equil,2004,220(1):116. [6] Hester K C,White S N,Peltzer E T,et al. Marine Chemistry,2006,98:309. [7] Gauglitz G,Vo-Dinh T. Handbook of Spectroscopy,Wiley-vch Verlag Gmb H & Co,2003. 99. [8] Gu Y,Zhou Y,Tang H,et al. Applied Physics B,2000,71:865. [9] Hanse S B,Berg R W. Applied Spectroscopy,2001,55(1):55. [10] CHENG Guang-xu(程光煦). Raman Brillouin Scattering(拉曼布里渊散射). Beijing:Science and Technology Press(北京:科学技术出版社),2007. [11] LU Tong-xing,LU Yi-qun(陆同兴,路轶群). Principle and Application of Laser Spectroscopy(激光光谱技术原理与应用). Hefei:China Science and Technology University Press(合肥:中国科学技术大学出版社),1999. [12] ZHANG Ming-sheng(张明生). Laser Light Scattering Spectroscopy(激光散射光谱学). Beijing:Science and Technology Press(北京:科学技术出版社) ,2008.