Solid State Spectroscopy by Synchrotron Radiation

1.利用分子科学研究所的远红外光谱仪测量了小尺寸Rb_2Agl_3和K_2Agl_3晶体的吸收。得到了具有许多精细结构的各向异性吸收谱。在RbAg_4I_5和KAg_4I_5超离子晶体中，在毫米波波段观察到反射率的增加，这可以解释为离子等离子体激元的作用。2.东北大学原子核科学研究室的S波段直线加速器加速的电子束在0.2T的磁场下弯曲，发出波长为0.2 ~ mm的强相干同步辐射。根据谱和一个聚束中的电子数计算了聚束形状因子，得到了束团中电子的分布函数，该分布函数近似为高斯分布，宽度约为0.3mm，分布函数具有尖锐的结构。利用相干辐射观察了RbAg_4I_5晶体的反射率，证实了毫米波区域的类Drude行为。通过安装超导磁体，研制了一套5 T磁场下的固体固体酸盐光谱系统。3.利用KUR京都大学L波段直线加速器的弯曲电子束，在1 ~ 8 mm波段观测到了极强的相干同步辐射，并首次观测到了相干切伦科夫辐射和尾流场辐射的光谱，其光谱形状与同步辐射的光谱形状相似。

1. The far-infrared spectroscopy port at The Institute for Molecular Science has been utilized to measure absorption of Rb_2Agl_3 and K_2Agl_3 crystals of small sizes. Anisotropic absorption spectra with many fine structure have been obtained. In superionic crystals of RbAg_4I_5 and KAg_4I_5 increase of reflectivity has been observed in the millimeter wave region, which can be interpreted as being due to the ionic plasmon. 2. The electron beam accelerated by an S-band linac at The Laboratory of Nuclear Science, Tohoku University, was bent by a magnetic field of 0.2 T to emit intense coherent synchrotron radiation in the wavelength range from 0.2 to mm. A bunch form factor was calculated from the spectrum and the number of electron in one bunch, and the distribution function of electron in a bunch was obtained from it. It was nearly a Gaussian with the width of about 0.3 mm. It has been concluded that the distribution function has a sharp structure. Using the coherent radiation, reflectivity of RbAg_4I_5 crystal was observed and Drude like behavior has been confirmed in the millimeter wave region. A system for solid steate spectroscopy under magnetic field of 5 T is prepared by installing a superconducting magnet. 3. By bendng electron beams from an L-band linac at KUR Kyoto University, extremely intense coherent synchrotron radiation was observed in the millimeter wave region from 1 to 8 mm. Spectra of coherent Cherenkov radiation and wake fieled radiation were also observed for the first time, which had similar shapes to the spectrum of the synchrotron radiation.