太赫兹自由电子激光ESR光谱技术及其在强磁场中的应用
THz-range free-electron laser ESR spectroscopy: techniques and applications in high magnetic fields
摘要：
利用皮秒脉冲自由电子激光（FEL）辐射，成功地实现了连续波太赫兹范围的电子自旋共振（ESR）谱。两个基于直线加速器的自由电子激光器（覆盖4 - 250 $μ$ m的波长范围）与高达70 T的脉冲磁场的组合允许在1.2 - 75 THz的频率范围内的多频ESR光谱，光谱分辨率优于1%。用2，2-二苯基-1-苦肼基（DPPH）和低维有机材料（C $_6$ H $_9$ N $_2$）CuCl $_3$的ESR谱说明了谱仪的性能。
英文摘要：
The successful use of picosecond-pulse free-electron-laser (FEL) radiation for the continuous-wave THz-range electron spin resonance (ESR) spectroscopy has been demonstrated. The combination of two linac-based FELs (covering the wavelength range of 4 - 250 $μ$m) with pulsed magnetic fields up to 70 T allows for multi-frequency ESR spectroscopy in a frequency range of 1.2 - 75 THz with a spectral resolution better than 1%. The performance of the spectrometer is illustrated with ESR spectra obtained in the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and the low-dimensional organic material (C$_6$H$_9$N$_2$)CuCl$_3$.
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