中文摘要：

采用反向碰撞方法进行了钒冲击实验，利用激光干涉测速技术对V／LiF窗口界面粒子速度剖面进行测量．通过对粒子速度剖面的分析获得了32～88GPa压力范围内钒的高压声速．实验获得的声速一冲击压力关系在约60GPa存在间断，表明钒发生了冲击相变．相变压力与静高压实验结果及第一性原理计算结果基本一致．

英文摘要：

A series of reverse-impact experiments is performed on vanadium at peak shock pressures from 32 GPa to 88 GPa. A displacement interferometer is used to measure the particle velocity profile at the vanadium/LiF window interface. Analysis of these profile provides a measure of sound velocity of vanadium in the Hugoniot state. The transition from body-centered cubic structure to rhombohedral structure phase at ~ 60 GPa is identified by the discontinuity of the sound velocity against shock pressure. This transition pressure is consistent with the data from high pressure diamond anvil cell experiments and first-principle calculations.