Abstract
Measurements of Raman backscattering spectra between −15°C and 22°C in liquid water (including its supercooled state) and in polycrystalline ice (−35°C to 0°C) at two excitation wavelengths (407 and 532nm) are presented. It is found that the spectrum-integrated backscattering cross-section of the 3400cm−1 band is about 1.2 times larger for ice in comparison to liquid water. The excitation-wavelength dependence of the cross-section in ice is very close to that in water. A discontinuous change of the spectrum is observed upon phase transition at 0°C. The results are applicable to preliminary calibration of lidar systems designed for water content surveys in the atmosphere.
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