Investigating the low-frequency vibrations of chlorophyll derivatives using terahertz spectroscopy
Coquillat, Dominique, Emma O’Connor, Etienne V. Brouillet, Yoann Meriguet, Cedric Bray, David J. Nelson, Karen Faulds, Jeremie Torres, and Nina Dyakonova. “Investigating the low-frequency vibrations of chlorophyll derivatives using terahertz spectroscopy.” In Terahertz Emitters, Receivers, and Applications XII, vol. 11827, p. 118270F. International Society for Optics and Photonics, 2021.
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.
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