Investigating the low-frequency vibrations of chlorophyll derivatives using terahertz spectroscopy

Coquillat, Dominique and O'Connor, Emma and Brouillet, Etienne V. and Meriguet, Yoann and Bray, Cedric and Nelson, David J. and Faulds, Karen and Torres, Jeremie and Dyakonova, Nina; Razeghi, Manijeh and Baranov, Alexei N., eds. (2021) Investigating the low-frequency vibrations of chlorophyll derivatives using terahertz spectroscopy. In: Terahertz Emitters, Receivers, and Applications XII. Proceedings of SPIE - The International Society for Optical Engineering . SPIE, USA. ISBN 9781510644922 (

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The terahertz absorption spectra of sodium magnesium chlorophyllin (Chl-Mg-Na) and sodium copper chlorophyllin (Cu-Chl), two major members of the chlorophyll derivative family, have been measured in the range 0.2-3.0 THz (6.6-100 cm-1), at room temperature. Additionally, surface-enhanced Raman scattering spectroscopy was used to supplement data in the higher frequency range. The capability of terahertz spectroscopy for quantitative characterization of Chl-Mg-Na intermolecular vibrations was investigated and the sensitivity of the 1.82-THz feature with degree of hydration by changes in the molecular environment was examined. For Cu-Chl derivative, a broad feature was observed around 1.8 THz which currently hinders clear Cu-Chl identification and quantification.