光致发光光谱研究金刚石光学中心的振动结构

摘要

金刚石中不同的缺陷中心具有不同的振动结构．间隙原子相关中心在离开零声子线165meV之外存在强且尖锐的局部振动模；空位相关中心具有很强的振动耦合，在其零声子线之后出现很强且宽的声子边带，而在165meV之外却观察不到局部振动模，且对于仅涉及一个空位的缺陷来说，其振动都与一个能量约为42meV的声子或一个能量约为67meV的声子或两声子有关．%The vibronic spectra mainly depend on the nature of the defects in diamond. The strong sharp local vibronic modes are observed for the interstitial-related centres beyond their phonon cut-off energy （165meV）, but not for the vacancy-related centres. The vibronic spectra of these vacancy-related centres show very strong and broad sidebands closely after the zero phonon lines. Further, the vibrations involving only one vacancy are due to two separate phonons or both, one has an energy of approximately 42 meV and the other has approximately 67 meV.