Abstract
Raman spectra of water were systematically investigated from 253 to 753K at 30MPa. The measurement reveals that increase of temperature causes significant deformation of Raman contours as well as blue shifts of central frequency by over 200cm−1, indicating breakup of hydrogen bonding network. The widespread hydrogen bonding tetrahedrons are considered to disappear beyond 673K where water enters supercritical state with small polymers like trimers and dimers remained. The referential Gaussian deconvolution of Raman contours into five components below 533K and four components beyond 533K respectively should represent that OH groups in water are engaged in stretching vibration with different energetic states which show strong temperature dependence.
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