Performance of BL4.1 infrared beamline at SLRI

Abstract

The mirror system of the infrared beamline, BL4.1, at the Synchrotron Light Research Institute was successfully re-aligned, and a new matching box was utilized to bring the collimated synchrotron-IR beam into the spectrometer. Fish sauce was used as the sample to examine the performance of the FT-IR measurements. It was found that synchrotron IR could resolve the secondary structure of amide I in the range 1600-1200 cm-1 while only the primary structure was observed when using IR from the Globar source. The absorption spectra taken using synchrotron IR exhibit a signal-to-noise ratio twice as high in the region 1290-1190 cm-1 and over ten times higher in the region 2550-2450 cm-1, comparing to those obtained by using the Globar source.