排序方式: 共有69条查询结果,搜索用时 312 毫秒
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采用金刚石对顶砧压机,在77K和不同压力下测量了半磁半导体Cd_(1-x)Mn_xTe(x=0.25,0.40,0.60)的光致发光光谱.分别在x=0.25和x=0.40的Cd_(1-x)Mn_xTe和Cd_(0.4)Mn_(0.6)Te中观察到两种不同性质的复合发光。根据发光峰的能量位置及其随压力的变化可以判定在Cd_(0.75)Mn_(0.25)Te和Cd_(0.6)Mn_(0.4)Te中的发光峰对应于带间复合发光,而Cd_(0.4)Mn_(0.6)Te中的发光峰对应于Mn离子3d↓能级到杂化价带的复合发光. 相似文献
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STRUCTURE STUDY OF MODULATION-DOPED Cd1-xMnxTe: In/CdTe STRAINED LAYER MULTIPLE QUANTUM WELLS
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The photomodulated reflectivity (PR) spectroscopy of modulation-doped diluted mag-netic semiconductor Cd1-xMnxTe: In/CdTe multiple quantum wells has been measured at 20-300K. Several spectral features associated with intersubband transitions have been found. The band structure of Cd1-xMnxTe: In/CdTe has been calculated by the Hartree self-consistent method. The results show that the theory is in agreement with experiments. In addition, an abnormal transition intensity ratio of 22H (the second heavy hole subband to the second electroa subband) to 11H (the first heavy hole subband to the first electron subband) caused by electron filled effect has been reported. At low temperature, a feature associated with Fermi level is observed, which has not been reported before. 相似文献
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光泵远红外激光器是远红外谱区的重要辐射源。在GaAs肖特基势垒二极管(SBD)外差混频远红外接收实验中,光泵远红外激光器作为信号源或本振源而得到应用。远红外激光与各种接收系统(例如SBD混频接收系统、准光学接收系统)的输入耦合,都与远红外激光辐射的场分布(模式)、输出功率以及偏振等辐射特性有密切关系。因此,远红外激光辐射特性的测量显得十分重要。 相似文献
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介绍了用于HI-13串列加速器质谱(AMS)测量的182Hf实验室参考标准的研制. 通过180Hf的连续热中子俘获产生182Hf, 用热电离质谱对初始参考标准的同位素比进行了精确测量. 取一定量的初始参考标准, 加入已知量的稳定同位素(180Hf)作为稀释剂, 通过逐级稀释的方法, 最终得到同位素比从10-6—10-10的一系列参考标准. 并对该系列参考标准进行了AMS测量, 结果显示182Hf/180Hf的测量值与标称值呈良好的线性关系, 说明该AMS系统可以准确测量同位素比在10-6—10-10范围内的样品. 相似文献
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In order to improve the accuracy of accelerator mass spectrometry (AMS) measurement for 182Hf/180Hf, a series of measurements have been taken in the AMS laboratory at the China Institute of Atomic Energy (CIAE). The major ones include the instantaneous monitoring of 180HfF5- current, testing the stability of transmission, the alternate measurements of an unknown sample and standard, and the origin identification and minimization of background 182W. The experimental details and the improvement in the measurement accuracy, as well as some useful suggestions for better satisfying the requirements of certain practical applications, are presented in this paper. 相似文献