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An extensive study on Raman spectra of water from 253 to 753K at 30MPa: A new insight into structure of water

Author:
Hu, Qingcheng   Lü, Xinbiao   Lu, Wanjun   Chen, Ying   Liu, Hong  


Journal:
Journal of Molecular Spectroscopy


Issue Date:
2013


Abstract(summary):

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


Page:
23-27


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