selection rule

• 选择定则

selection rule的用法和样例：

例句

1. Forbidden transitions are those for which dipole radiative transitions are not allowed by the selection rules.
   禁戒跃迁指的是选择定则所不容许的偶极辐射跃迁。
2. The relaxation of Raman selection rules in cubic nanophase is attributed to local rhombohedral distortion.
   拉曼选择定则的弛豫源于纳米晶基体具有局域三方晶格畸变。