Figure 1.

Decomposed Raman spectra of Ca(ClO₄)₂ • 4H₂O, water ice, and liquid water: (a) The decomposed O-H vibrational spectrum of hydrated Ca(ClO₄)₂ at −50°C, 800 Pa, and 100% RH shows eight Gaussian components, at 3446, 3471, 3487, 3515, 3542, 3564, 3603, and 3628 cm⁻¹, with . (b) Water ice at −80°C and 800 Pa indicating five Gaussian components, at 3046, 3115, 3227, 3336, and 3399 cm⁻¹, with . (c) Decomposition of the O-H vibrational region of the spectrum of liquid water [Zhang and Chan, 2003], indicating four broad Gaussian components, at 3230, 3420, 3540, and 3620 cm⁻¹, with .