Qiao Er-wei, Zheng Hai-fei, Sun Qiang
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Science, Peking University, Beijing 100871, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2005 Sep;25(9):1429-31.
This paper investigates the structure of methanol by Raman spectrum in diamond anvil cell up to 563 K. The result shows that pressure increases at elevated temperature, but the effect of pressure on the stretching vibrational modes of C-H is inverse to that of temperature. The action of temperature is weaker than that of pressure. So the spectral profile of stretching vibrational modes of C-H gradually changes and the Raman shift moves to higher frequency with increasing temperature and pressure, indicating that the bonding energy of C-H bonding increases with temperature and psessure. In addition, the increase of the relative peak area of O-H stretch band with both the temperature and pressure indicates that the total intensity of O-H bonding is greater compared with that of C-H bonding. Thus, it can be inferred that the higher pressure might slow down the transforming process of kerogen to hydrocarbon under the geological condition.
本文利用拉曼光谱研究了在高达563K的金刚石对顶砧池中甲醇的结构。结果表明，在升高温度时压力会增加，但压力对C-H伸缩振动模式的影响与温度的影响相反。温度的作用比压力的作用弱。因此，随着温度和压力的升高，C-H伸缩振动模式的光谱轮廓逐渐变化，拉曼位移向更高频率移动，表明C-H键的键能随温度和压力增加。此外，O-H伸缩带相对峰面积随温度和压力的增加表明，与C-H键相比，O-H键的总强度更大。因此，可以推断在地质条件下较高的压力可能会减缓干酪根向烃类转化的过程。
