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通过数值计算,我们得到一维双原子链在自由边界与循环边界条件下的频谱。在自由边界条件下,存在一中频模。原子链在这一模下的振动花样与在循环边界条件下的情况有很大不同。
By numerical calculation, we get the spectrum of one-dimensional diatomic chains under the free boundary and the cyclic boundary conditions. Under free boundary conditions, there is an IF mode. The vibrational pattern of the atomic chain in this mode is quite different from that under cyclic boundary conditions.