Light Scattering Study of the Elementary Process in the Crystal Growth from Melt.

（1）完成了超喇曼散射系统的研制，在本课题中，从固（晶）相和熔体相的界面区域观察位置灵敏的光谱是非常重要的。根据我们的几个初步实验和数值模拟，发现由于两相的折射率相差很大，在界面区存在很强的弹性散射光。在许多情况下，弹性分量是如此之强，以至于它覆盖并严重扭曲了从界面redon散射的光谱的低频分量，这对于从熔体中生长晶体的基本过程的动力学是必不可少的。我们已经成功地建立了一个新的超弹性散射系统，能够观察光谱的低频分量，而不受强弹性光的影响。（2）晶体-熔体系统的光谱观测：利用具有对称中心的晶体系统，观测到界面区的超喇曼散射光谱。在本研究的过程中，下一阶段的参考文献在本基金的资助下出版。

(1)Hyper-Raman scattering system has been completed.It is very important in the present project to observe a position sensitive spectrum from the interface region between the solid (crystal) and the melt phases. According to our several preliminary experiments and also to a numerical simulation, it was found that there exists a very strong elastic scattering light in the interface region due to the considerable difference in the refractive indices of the both phases. In many cases the elastic component was so strong that it covered and distorted heavily the low frequency component of the spectrum of the light scattered from the interface redon, which would be essential for the dynamics of the elementary process of the crystal growth from the melt. We have succeeded to build-up newly a hyperraman scattering system capable to observe the low-frequency component of the spectra without any influence of the strong elastic light.(2)The observation of the spectra of the crystal-melt system.Using a crystal system with center of symmetry, the hyper-Raman scattering spectra of the interface region have been observed. On the way of the present research, the references shown in the next pace were published with the aids of the present grant.