在温度21 ℃和压力50～1 100 MPa范围内利用碳化硅压腔进行了10％的NaCl水溶液的Raman光谱的原位测量和研究。 研究发现： 溶液的Raman拟合谱峰在50～300 MPa压力范围内, 随着压力的增加向低波数方向移动, 在约300 MPa时达到最小值； 在300～800 MPa压力范围内, 压力的升高则导致谱峰向高波数方向移动, 在约800 MPa时达到最大值； 随着压力的进一步升高(＞800 MPa), 谱峰又向低波数方向移动。 类似地, 拟合谱峰的峰面积比值和半高宽在压力约300和800 MPa时也发现了不连续现象。 这表明高压下NaCl水溶液的内部结构是不连续的, 溶液中的氢键(O—H…Cl－)发生了相应的变化, 意味着溶液中出现了结构的重新排列, 产生了较为复杂的结构构型。

In-situ Raman spectra measurement for aqueous NaCl solution was conducted at the temperature of 21 ℃ and the pressures of 50-1 100 MPa using a SiC anvil cell. It is shown that the decomposed bands of aqueous NaCl solution shift to lower wavenumber with increasing pressure initially and reaches the minimum at about 300 MPa, and increases at higher pressure up to about 800 MPa, then decreases again with increasing pressure. Similarly, the ratio of band-area and the width at half maximum of the decomposed bands of the solution exhibit discontinuities at about 300 and 800 MPa. This finding demonstrates that the structure of aqueous NaCl solution is discontinuous at high pressure and O—H…Cl－ bonds change correspondingly, which suggests the existence of rearrangement and the appearance of more complicated configuration in the interior structrure of aqueous NaCl solution.