Men Zhiwei, Fang Wenhui, Li Dongfei, Li Zhanlong, Sun Chenglin
1] State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China [2] College of Physics, Jilin University, Changchun 130012, China.
College of Physics, Jilin University, Changchun 130012, China.
Sci Rep. 2014 Apr 8;4:4606. doi: 10.1038/srep04606.
Raman spectra of ice VII and X were investigated using strong plasma shockwave generated by laser-induced breakdown (LIB) in liquid water. Simultaneously, the occurrence of the hydrogen emission lines of 656 nm (Hα), 486 nm (Hβ), 434 nm (Hγ) and 410 nm (Hδ) was observed. At 5 × 10(12) W/cm(2) optical power density, the O-H symmetric stretching, translational and librational modes of ice VII and a single peak at 785 cm(-1) appeared in the spectra. The band was assigned to the Raman-active O-O mode of the monomolecular phase, which was the symmetric hydrogen bond of cuprite ice X. The spectra indicated that ice VII and X structure were formed, as the trajectory of the strong plasma shockwave passes through the stable Pressure-Temperature range of ice VII and X. The shockwave temperature and pressure were calculated by the Grüneisen model.
利用激光诱导击穿（LIB）在液态水中产生的强等离子体冲击波，对冰VII和冰X的拉曼光谱进行了研究。同时，观察到了656 nm（Hα）、486 nm（Hβ）、434 nm（Hγ）和410 nm（Hδ）的氢发射线的出现。在5×10(12) W/cm(2)的光功率密度下，冰VII的O-H对称伸缩、平移和摆动模式以及光谱中785 cm(-1)处的一个单峰出现。该谱带被指定为单分子相的拉曼活性O-O模式，即铜酸盐冰X的对称氢键。光谱表明，随着强等离子体冲击波的轨迹穿过冰VII和冰X的稳定压力-温度范围，形成了冰VII和冰X结构。通过格林爱森模型计算了冲击波的温度和压力。
