超晶格量子阱的沟道辐射及其谱分布
Channeling Radiation and Spectral Distribution for Superlattice Quantum Wells
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摘要: 在经典物理框架内和偶极近似下， 导出了超晶格量子阱沟道辐射频率和辐射谱分布。指出了对于自发辐射谱分布， 存在一个普适的线型因子， 而粒子的最大辐射能量与相对论因子γ 有关， 且与γ3/2成正比。以正弦平方势为例进行了具体讨论。结果表明， 由于势阱深度和噪音的影响， 谐波数l只取少数几个值。超晶格量子阱沟道辐射只存在不多的几条谱线， 为进一步应用提供了可能。最后， 还给出了一种可能的实验方案， 讨论了如何利用弯晶把超晶格量子阱的沟道辐射改造为相干辐射。 In the frame of classical physics and the dipole approximation the radiation frequency and the spectral distribution are derived for the channeling radiation of a charged particle in a superlattice quantum well. It indicated that there is a linetype factor f(ξ) suited to various cases in the spontaneous radiations spectrum. Results also show that the maximum radiation energy is proportional to γ3/2 , but the relativistic effects have double effects in the spontaneous radiation of a charged particle. The case for the sinesquared potential is discussed specifically. The harmonic number can be defined as a few variable values by the effects of the potential well depth and noise. In general there is a few spectral lines in the channeling radiation spectrum for the superlattice quantum well, and possibilities are provided for further application. Finally, a possible experimental scheme is proposed, and it is discussed that how to transform the channeling radiation in the quantum well into the cohenent radiation by the bent crystal.Abstract: In the frame of classical physics and the dipole approximation the radiation frequency and the spectral distribution are derived for the channeling radiation of a charged particle in a superlattice quantum well. It indicated that there is a linetype factor f(ξ) suited to various cases in the spontaneous radiations spectrum. Results also show that the maximum radiation energy is proportional to γ3/2 , but the relativistic effects have double effects in the spontaneous radiation of a charged particle. The case for the sinesquared potential is discussed specifically. The harmonic number can be defined as a few variable values by the effects of the potential well depth and noise. In general there is a few spectral lines in the channeling radiation spectrum for the superlattice quantum well, and possibilities are provided for further application. Finally, a possible experimental scheme is proposed, and it is discussed that how to transform the channeling radiation in the quantum well into the cohenent radiation by the bent crystal.
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