Abstract
We have constructed a multi-channel Raman spectrometer that is capable of recording the low frequency region down to 5 cm<sup>−1</sup> with a measurement time of a few tenths of a second. An iodine vapor filter, which uses a narrow (∼0.03 cm<sup>−1</sup>) absorption line of iodine for Rayleigh scattering elimination, is combined with a multi-channel Raman spectrometer composed of a single polychromator and a charge-coupled device (CCD) camera. Thanks to the high Rayleigh scattering elimination efficiency of the filter, which is over 10<sup>6</sup>, Raman spectra of microcrystalline L-cystine from −300 cm<sup>−1</sup> to 1000 cm<sup>−1</sup> are simultaneously measurable with a small gap of 10 cm<sup>−1</sup> (−5 cm<sup>−1</sup> to 5 cm<sup>−1</sup>). Although raw spectra contain many sharp spikes due to the fine structures of iodine absorption, they can be correctly compensated with the use of a transmittance spectrum measured under the same experimental conditions. Many Raman bands including the 9.8 cm<sup>−1</sup> band are measured with a high signal-to-noise ratio in both the Stokes and anti-Stokes sides with a measurement time as short as 0.2 s.
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