The present status of infrared synchrotron radiation (IRSR) at UVSOR-II and the application to an infrared reflection-absorption spectroscopy (IRAS) in the IR and terahertz (THz) regions using IRSR are reported. At UVSOR-II, the IRSR beam line has been upgraded to make a powerful IR-THz light source. An IRAS experiment covering the wave number range below 1,000 cm
−1 was started to investigate adsorbed molecules on surfaces. The Alq
3/Ag system was investigated using the apparatus. The Al-N stretching mode at around 420 cm
−1 was clearly observed and the peak frequency changes to 440 cm
−1 after the potassium doping. This is the evidence for the charge transfer to the Alq
3 molecule from the potassium ion.
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