Laser-Cooling of Liquid Water by the Ar-Xe Laser Radiation

Details Laser-Cooling of Liquid Water by the Ar-Xe Laser Radiation Laser-Cooling of Liquid Water by the Ar-Xe Laser Radiation

2010-11-02

arxiv.org/abs/1011.0670v1

Physics

Condensed Matter

Other Condensed Matter

6 pages, 5 figures

Scientific paper

An effect of laser-cooling of water was observed for the first time with a temperature decrease dT = -2.2 K after irradiation of liquid water surface by a powerful Ar-Xe pulse laser with a pulse energy of about 1 J and wavelength L = 1.73, 2.63 and 2.65 um. The discovered effect can apparently be ascribed to the optical excitation of vibrational states of H2O molecules followed by an endothermic consolidation of chemically active excited molecules into a quasi-stable cluster-like structure. The measured time dependences of the cooling effect show that a typical life time of the new state of water amounts to hours. It has also been shown that the life time of the excited vibrational molecular states due to a radiation trapping effect can be estimated to at least hundreds of seconds.

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