任何异核双原子分子必然具有偶极矩，因为它的两端是不同的。
Any heteronuclear diatomic molecule must have a dipole moment since its two ends are different.
建立了偶极矩、核四极矩偶合常数中的场梯度及晶体非线性光学系数的近似理论表达式。
Approximate theoretical expressions are given for dipole moment, field gradient at the nucleus, and nonlinear susceptibility of crystals.
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