Image Details
Caption: Figure 3.
FTIR spectra of halite crystals grown from NaCl solutions containing 0 (control), 6.7, 67, and 133 mM glycine, alongside a pure glycine powder standard. Spectra are normalized from 0 to 1. Dashed lines indicate diagnostic vibrational modes of zwitterionic glycine: asymmetric NH﹩{}_{3}^{+}﹩ stretching (∼3174 cm−1), asymmetric CH2 stretching (∼3008 cm−1), and symmetric CH2 stretching (∼2971 cm−1).
© 2026. The Author(s). Published by the American Astronomical Society.