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晶体的表面具有与体内不同的晶格对称性,因而在表面可以存在三维晶格中所没有的格波,其量子即表面声子.然而从实验上观察表面声子往往由于不易与量子能量相近的体声子区分而较难实现.高分辨率电子能量损失谱(HRELs)的出现使得这一实验难
The crystal surface has different lattice symmetry with the body, so there can be three-dimensional lattice in the surface lattice not exist in the surface, its quantum surface sonophone.However, from the experimental observation of surface phonons are often not as close to the quantum energy Of phonon subdivision and more difficult to achieve.High resolution electron energy loss spectroscopy (HRELs) makes this experiment difficult