Accurate absolute measurements of the Raman backscattering differential cross-section of water and ice and its dependence on the temperature and excitation wavelength

作者：Plakhotnik Taras^*; Reichardt Jens

来源：Journal of Quantitative Spectroscopy and Radiative Transfer, 2017, 194: 58-64.

DOI：10.1016/j.jqsrt.2017.03.023

• Raman backscattering
• Cross-section
• Water
• Ice
• Phase transition

Measurements of Raman backscattering spectra between -15 C-omicron and 22 C-omicron in liquid water (including its supercooled state) and in polycrystalline ice (-35 C-omicron to 0 C-omicron) at two excitation wavelengths (407 and 532 nm) are presented. It is found that the spectrum-integrated backscattering cross-section of the 3400 cm(-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-omicron. The results are applicable to preliminary calibration of lidar systems designed for water content surveys in the atmosphere.

• 出版日期2017-6