Raman spectra of proton order of thin ice Ih film

The polarized Raman spectra of the upper part of a thin ice Ih film were obtained in the range of 150cm(-1) to 3800cm(-1). The spectra showed clear polarization dependence; several new peaks were also observed. The longitudinaloptic-tranverseoptic (LO-TO) splitting of the mode near 220cm(-1) in the translational vibration region was experimentally confirmed at 133K. The Fermi resonance between the bending overtone (around 3270cm(-1)) and symmetry stretching fundamental (around 3350cm(-1)) in the stretching vibration region appeared at nearly the same temperature. Results showed that ice XI (i.e. proton-ordered phase of ice Ih) slowly formed in the upper part of a thin ice Ih film without KOH as the temperature gradually decreased below 133K. Copyright (c) 2015 John Wiley & Sons, Ltd.