First hyperpolarizabilities DALTON

Second harmonic generation (SHG) is forbidden in centrosymmetric molecular materials. However, a signal is frequently observed from interfaces where the symmetry is broken....二次谐波生成（Second Harmonic Generation，SHG）在中心对称分子材料中属于禁阻过程。然而，在对称性破缺的界面处，却常能观测到该信号。