同步辐射红外光源及其应用.pdf

同步辐射红外光源及其应用 红外波谱 IR units: wavenumbers (cm-1), The Infrared Part of the EM Spectrum 10 micron wavelength = 1000 cm-1 Near-IR: 4000 – 14000 cm-1 1 eV ~ 8100 cm-1 Mid-IR: 500 – 4000 cm-1 1 THz ~33 cm-1 Far-IR: 5 – 500 cm-1 300 Kelvin ~210 cm-1 IR covers ~ 1 meV to 1 eV 红外波谱 红外光谱－历史 红外光谱－历史 1976 First observation of IRSR (Stevenson, Lagarde) 1985 First IRSR spectrum (Berlin) 1985 First beamline at UVSOR (Nanba) 1987 Beamline with users at Brookhaven (Williams) 1995 First int. workshop on IRSR, Rome. 1995 Observation of edge radiation, Madison. 2001 First beamline exploiting edge radiation, Karlsruhe 2002 Emission from coherent bunch modes, Berlin (Schade) Worldwide Synchrotron Facilities for Infrared SRC UW NSRL ALS LBL NSLS BNL CAMD LSU 同步辐射红外的特点： 全谱段高亮度 远红外和THz波段更高的强度 时间结构 “Throughput limited”测量！！！ 衍射限制的显微 极端条件下的谱学 • 更高的空间分辨率 • 高压 • 更好的信噪比 • 低温和强磁场 • 更短的采集时间 受限制的入射角 高谱学分辨率 • 掠入射 • 更好的信噪比 • 衰减全反射（ATR ） • 椭偏光谱 SRIR source Constant field of Bending magnet λ 13 θnat 1.66188( ) ρ 1000cm-1 (10um) 100cm-1 (100um) Edge radiation sudden change of the longitudinal velocity when particle enter or exit a magnetic e