The Optical Properties of Liquid Chalcogens at High Temperature and Pressure
The Optical Properties of Liquid Chalcogens at High Temperature and Pressure
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高温高压液态硫属元素的光学性质
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
H. Endo
中科院分区：
文献类型：
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作者：
H. Ikemoto;I. Yamamoto;M. Yao;H. Endo
测量了S、Se、Te、Se 80Te 2 0、Se 5 0 Te 5 0和Se 2 0 Te 80液体在0.5~5.4 eV能量范围内的光学反射率的温度和压力变化。光导σ(ω)是用振子拟合法推导出来的。液体S和Se的σ(ω)曲线有一个宽峰，该峰被认为是同一链中相邻位置上从孤对到反键σ*态的光学跃迁。在高温高压下，液体Se的σ(ω曲线出现德鲁德项。在这一区域内，液态Se从半导体态转变为金属态，伴随着热力学性质的变化。液体Te在2 eV附近观察到的宽峰可能表明共价键合的两重结构仍在熔化。
The temperature and pressure variations of optical reflectivity of liquid S, Se, Te, Se 80 Te 20 , Se 50 Te 50 , and Se 20 Te 80 have been measured in the energy range between 0.5 and 5.4 eV. Optical conductivity σ(ω) has been derived by using an oscillator fitting analysis. The σ(ω) curve for liquid S and Se has a broad peak, which is assigned to the optical transition from the lone pair to the antibonding σ * states on the adjacent site in the same chain. At high temperature and high pressure, there appears the Drude term in the σ(ω) curve of liquid Se. In this region, liquid Se is transformed from semiconducting to metallic state, which is accompanied by changes in the thermodynamic properties. The observed broad peak around 2 eV for liquid Te may suggest that the covalently bonded twofold structure remains on melting.