水之魂 (The Soul of Water)分享 http://blog.sciencenet.cn/u/ecqsun 上善若水

博文

定量拉曼谱(Q-Raman):德拜温度与原子结合能的测定

已有 2667 次阅读 2012-9-7 10:43 |个人分类:计量声谱|系统分类:论文交流|关键词:energy| Energy

Raman spectroscopy determination of the Debye temperature and atomic cohesive energy of CdS, CdSe, Bi2Se3, and Sb2Te3 nanostructures

JPA 112, 083508 (2012)

We have formulated the size and temperature dependence of the phonon relaxation dynamics for CdS, CdSe, Bi2Se3 and Sb2Te3 nanostructures based on the framework of bond order–length–strength (BOLS) correlation and the local bond averaging (LBA) approach. The Raman shifts are correlated directly to the identities (nature, order, length, and energy) of the representative bond of the specimen without needing involvement of the Grüneisen parameters or considering the processes of phonon decay or multi-phonon resonant scattering. Quantitative information of the Debye temperature, the atomic cohesive energy, the reference frequencies from which the Raman shifts proceed, and the effective coordination numbers of the randomly sized particles, as well as the length and energy of the representative bond has been obtained. It is clarified that the size-induced phonon softening arises intrinsically from the cohesive weakening of the undercoordinated atoms in the skin up to three atomic layers and the thermally-derived phonon softening results from the thermally lengthening and weakening of bonds. Developed approach empowers the Raman technique in deriving quantitative and direct information regarding bond stiffness relaxation with applied stimuli such as coordination, mechanical, thermal and chemical environment, which are crucial to practical applications.

 


 

 



http://blog.sciencenet.cn/blog-73032-610042.html

上一篇:水之魂11:水分子团簇反常物性之解
下一篇:水之魂12: 浮冰之力

8 姜如 秦伟 薄茂林 郭念贵 杨学弦 张晗 MassSpec1688 ddsers

该博文允许注册用户评论 请点击登录 评论 (0 个评论)

数据加载中...

Archiver|手机版|科学网 ( 京ICP备14006957 )

GMT+8, 2018-7-23 19:57

Powered by ScienceNet.cn

Copyright © 2007-2017 中国科学报社

返回顶部