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295 K和1.1～3.3 GPa条件下,通过冰Ⅵ-Ⅶ的OH伸缩振动Raman光谱分析,对压力与冰Ⅵ-Ⅶ结构的关系进行了研究.可以看出:(i)在1.1～1.7 GPa范围内,OH的伸缩振动频率随压力升高而降低,dv_1/dp=-66.66 cm~(-1)·GPa~(-1);(ii)压力为2.1GPa时,OH的伸缩振动明显向高频方向移动;(iii)随着压力进一步增大(2.1～3.3 GPa),OH的伸缩振动再次向低频方向移动,dv_1/dp=-22.5 cm~(-1)·GPa~(-1).这是由于压力升高导致d_(OH)增大造成的;而压力为2.1 GPa时,OH的伸缩振动频率的突变则是冰Ⅵ-Ⅶ相变的结果.此外,根据冰Ⅶ的Ⅹ衍射数据,发现d_(OO)与压力存在以下经验公式:d_(OO)=0.0014 P~2-0.042 P+3.0028.
295 K and 1.1 ~ 3.3 GPa, the relationship between pressure and Ⅵ-Ⅶ structure was studied by OH stretching vibration Raman spectroscopy of ice Ⅵ-Ⅶ, it can be seen that: (i) in the range of 1.1-1.7 GPa The stretching vibration frequency of OH decreases with increasing pressure, dv_1 / dp = -66.66 cm -1 (-1) GPa -1. (Ii) When the pressure is 2.1 GPa, the stretching vibration of OH is obviously higher (Iii) As the pressure increases further (2.1 ~ 3.3 GPa), the stretching vibration of OH shifts to low frequency again, dv_1 / dp = -22.5 cm -1 GPa -1. This is attributed to the increase of d_ (OH) due to the increase of pressure, while at 2.1 GPa, the change of OH stretching vibration frequency is the result of Ⅵ-Ⅶ phase transition.Furthermore, It is found that the following empirical formula exists for d OO and pressure: d OO = 0.0014 P ~ 2-0.042 P + 3.0028.