常看到Spectral Line Half-Width 被翻译成半值波长，字面意思是光谱线半宽度，其物理意义是：在该谱线上，光强为最大的波长与其光强只有最大值之半的波长两者间的差值。
实验得到的半波长与理论计算值在误差范围内一致，晶面沟道方向的阻止本领略大于随机方向的阻止本领。
The experimental half wavelength I in agreement with the calculated value within the limit of error and the planar channeled stopping power is slightly greater than the random stopping power.
另一种方法是用优化方法求得屈曲半波长及其相应的屈曲临界值。
The other method is to get half wave length and related critical buckling value with optimization.
用该方法实现弹性波正演模拟只要算子半长度取到4—6，每波长取3个采样点即可获得精度很高的波场值。
The operator half length takes to 4-6 and each wave length takes 3 sampling, then the precise wave field can be obtained.
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