摘要
指出双原子链的晶格振动分为声学支和光学支是由于采用循环边界条件所造成的结果 .若采用自由边界条件 ,则模花样和振动频谱完全不同 ,这时只能分为低频支。
The acoustical branch and optical branch in lattice vibrational spectrum of biatomic chain only result from the cyclic boundary condition. The vibrational modes and spectrum are very different if the free boundary condition is adopted, and the spectrum is divided into low, medium and high frequency branches.
出处
《大学物理》
北大核心
2002年第3期9-11,共3页
College Physics
