SURFACE POLAR ORDERING IN A LIQUID-CRYSTAL OBSERVED BY OPTICAL 2ND-HARMONIC GENERATION
SURFACE POLAR ORDERING IN A LIQUID-CRYSTAL OBSERVED BY OPTICAL 2ND-HARMONIC GENERATION
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DOI：
10.1103/physrevlett.57.2963
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发表时间：
1986-12-08
影响因子：
8.6
通讯作者：
SHEN, YR
中科院分区：
文献类型：
--
作者：
GUYOTSIONNEST, P;HSIUNG, H;SHEN, YR
利用光学二次谐波作为探针，我们在8CB-玻璃界面的单层中观察到4 ' - n -辛基- 4 -氰联苯（8CB）分子的极性有序，但在8CB的自由表面和体中，分子形成四极型对时是非极性有序的。表面极性有序与温度无关，且不受块状8CB中相变的影响。
Using optical second-harmonic generation as a probe, we have observed polar ordering of 4′− n− octyl− 4− cyanobiphenyl (8CB) molecules in a monolayer at an 8CB-glass interface, but nonpolar ordering at the free surface of 8CB as well as in the bulk with the molecules forming quadrupole-type pairs. The surface polar ordering was independent of temperature and unaffected by the phase transitions in the bulk 8CB.