排序方式: 共有50条查询结果,搜索用时 234 毫秒
1.
2.
3.
4.
5.
6.
The Raman scattering on a novel liquid crystal side chain polymer, poly-2,5-bis (p-meth-oxybenzoyloxy) styrene, has been performed. We observed that the characteristic Raman sp-ctra of the vinyl group in the monomer changed much deeply in the polymer, especially for the Raman line correponding to the C=C of the vinyl group which disappeared completly in the polymer. Contrast with that, the Raman spetra of the rest group did not present any substantial difference between the monomer and the polymer. These experimental facts show-ed that the vinyl group of the monomer was tranfered to the polymeric backbone while the chemical structure of the mesogenic unit in the monomer remained after the polymerization,and also conformed that it was successful in the synthesis of a liquid crystal side chain plymer without a flexible spacer between the mesomorphic unit and the molecular main chain. 相似文献
7.
A comprehensive study on Raman spectroscopy with different excitation wavelengths, sample sizes, and sample shapes for optic phonons (OPs) and acoustic phonons (APs) in polar and non-polar nano-semiconductors has been performed. The study affirms that the finite size effect does not appear in the OPs of polar nano-semiconductors, while it exists in all other types of phonons. The absence of the FSE is confirmed to originate from the long-range Fr¨ohlich interaction and the breaking of translation symmetry. The result indicates that the Raman spectra of OPs cannot be used as a method to characterize the scale and crystalline property of polar nano-semiconductors. 相似文献
8.
本文将报告对硅纳米线、多孔硅、Si C纳米棒和碳纳米管等一维纳米体系的本征拉曼光谱及其特征的研究结果 ,并讨论拉曼光谱在上述材料的几何和物理特性研究中的应用。 相似文献
9.
突破分辨率极限的拉曼光谱学——简介近场光学与近场拉曼光谱 总被引:2,自引:0,他引:2
突破分辨率极限的拉曼光谱学——简介近场光学与近场拉曼光谱张树霖(北京大学物理系北京100871)TheRamanSpectroscopyBrokentheDifractionLimitation——Introductiontothenear-fiel... 相似文献
10.
中国物理学会光散射专业委员会──第三届光散射专业委员会工作报告中国物理学会光散射专业委员会秘书长张树霖本届专业委员会本着组织光散射领域的学术交流和提高研究水平.并为广大会员服务的宗旨,开展了专业委员会的工作。本届专业委员会已任期四年届满,现将四年来主... 相似文献