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

Auteur(s): Coquillat D.(Corresp.), O'connor Emma, Brouillet Etienne(Corresp.), Meriguet Y., Bray C., Nelson David j., Faulds Karen, Torres Jeremie, Diakonova N.

Conference: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States (San Diego, US, 2021-08-02)
Actes de conférence: Proceedings Volume 11827, Terahertz Emitters, Receivers, and Applications XII; 118270F (2021), vol. p.118270F (2021)

DOI: 10.1117/12.2593589

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.