| KH_2PO_4晶体的太赫兹-紫外光谱 |
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| 作者姓名： | Hou BH Wang YL Chang XA Li SS Zhao GZ Hao W |
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| 基金项目： | 国家重点基础研究发展计划项目，中国科学院研究生院院长基金项目 |
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| 摘 要： | 实验测量了室温下磷酸二氢钾KH2PO4(KDP)晶体0.2～1.6THz的时域光谱,以及50～4000cm-1范围内的远红外光谱,200～2000nm的紫外-可见-红外光谱。KDP晶体的禁带宽度是5.91eV。在测量范围内有一个很宽的声子吸收带。从0.2～205.5THz吸收系数在35～80cm-1,声子吸收的低频端小于0.2THz。最高的纵光学模声子的频率νLO大约是205.5THz,由此求出这支声子的H—O键的力常数为13.13N·cm-1。
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| 关 键 词： | THz光谱 红外-紫外光谱 KH2PO4晶体 声子吸收 |
THz-ultraviolet spectra of KDP crystal |
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| Hou BH,Wang YL,Chang XA,Li SS,Zhao GZ,Hao W.THz-ultraviolet spectra of KDP crystal[J].Spectroscopy and Spectral Analysis,2010,30(11):2881-2884. |
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| Authors: | Hou Bi-hui Wang Ya-li Chang Xin-an Li Shun-suo Zhao Guo-zhong Hao Wei |
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| Institution: | College of Applied Sciences, College of Material Sciences and Engineering, Beijing University of Technology, Beijing 100124, China. houbh@bjut.edu.cn |
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| Abstract: | THz time domain spectrum of KH2PO4 crystal in the range from 0.2 to 1.6 THz, the far-infrared spectrum in the range from 50-4000 cm(-1), and ultraviolet-visible-infrared spectrum in the range from 200-2000 nm were measured at the room temperature. The energy band gap Eg of KH2PO4 Crystal is 5.91 eV. There is a wide band of the phonon absorption in the KDP crystal. The values of the absorption coefficient are 35-80 cm(-1) in the range from 0.2 to 205.5 THz. The end of the low frequency of the optical phonon model is smaller than 0.2 THz. The highest frequency upsilonLO of the longitudinal optical phonon model LO is about 205.5 THz, and the force constant K of H-O ionic chemical bond stretch vibration from the omegaLO was calculated to be 13.13 N x cm(-1). |
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