Wang Menghan, Lu Wanjun, Li Lanlan, Qiao Shaohua
China University of Geosciences, State Key Laboratory of Geological Processes and Mineral Resources, Wuhan 430074, P.R. China.
Appl Spectrosc. 2014;68(5):536-40. doi: 10.1366/13-07316.
Raman peaks of the asymmetric stretching vibration (ν3) and the asymmetric bending overtone (2ν2) of methane were studied at elevated pressures and temperatures, from 3 to 51 MPa and from 298.15 to 473.15 K. The peak intensity ratios of ν3 and 2ν2 were calculated, and the relationship among peak intensity ratio, temperature, and pressure/density were derived using equations. Such relationships allow geologists to determine the pressure and density of methane fluid inclusions using Raman spectroscopic measurements of the peak intensity ratios of ν3 and 2ν2.
在3至51兆帕的压力和298.15至473.15开尔文的温度下，研究了甲烷的不对称伸缩振动（ν3）和不对称弯曲泛频（2ν2）的拉曼峰。计算了ν3和2ν2的峰强度比，并通过公式推导了峰强度比、温度与压力/密度之间的关系。这些关系使地质学家能够利用ν3和2ν2峰强度比的拉曼光谱测量来确定甲烷流体包裹体的压力和密度。
