正交对称中的塞曼调制自旋回波
Zeeman Modulated Spin Echo in Orthorhombic Symmetry
摘要：
内外磁场对自旋回波信号包络调制的实验研究是探测微小内磁场的重要光谱工具。本文导出了正交对称晶体中原子核的自由感应衰减和场相对于晶轴任意取向时自旋回波信号的频谱和幅度。结果再现的结果，没有调制应观察到在tetraxite晶体沿c轴或任何方向在基面的字段，并给出详细的信号作为正交参数的函数。它们用于讨论最近的实验结果，并为未来的实验提供指导。
英文摘要：
The experimental study of the modulation of the envelope of spin-echo signals due to internal and external fields is an important spectroscopic tool to detect very small internal magnetic fields. We derive the free induction decay and the frequency spectrum and amplitude of spin-echo signals for arbitrary orientation of fields with respect to crystalline axis for nuclei in a crystal of orthorhombic symmetry. Results reproduce the results that no modulation should be observed in tetragonal crystals for fields either along the c-axis or any direction in the basal plane and give details of the signal as a function of the orthorhombicity parameter. They are used to discuss recent experimental results and provide guidelines for future experiments.
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