用群论方法给出了一种具有特殊本征对称性的四阶张量在各点群晶体中的形式，并将其应用于声光散射转动效应的研究，获得了有意义的结果。

The form of a four-rank tensor with the particular intrinsic symmetry for a variety of crystal symmetry is given by the use of the group theory method.

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因此，晶体在投入使用之前，测量它的本征宽度，为单色仪的调试提供依据是非常必要的。

So it's necessary to measure the intrinsic width and the error in the normal direction of the crystals to provide basis for the monochromator alignment.

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在新的色散关系下，用求解系统本征值的方法讨论了光子晶体中单个二能级原子的自发辐射形成的光场-原子束缚态的性质。

With this new dispersive relationship and solution, the trapped state of photon-atom of single two-level atom in photonic crystal is discussed.

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