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J Phys Chem B. 2011 Jun 16;115(23):7693-8. doi: 10.1021/jp2023154. Epub 2011 May 19.

Oxygen-dependent auto-oscillations of water luminescence triggered by the 1264 nm radiation.

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  • 1Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290 Russia.

Abstract

A 5-min exposure of air-saturated bidistilled water to low-intensity laser infrared radiation at the wavelength of the electronic transition of dissolved oxygen to the singlet state ((3)∑(g)(-)→ (1)Δ(g)) induces, after a long latent period, auto-oscillations of water luminescence in the blue-green region, which last many hours. Laser irradiation causes the accumulation of hydrogen peroxide, which depends on the concentration of dissolved oxygen. The auto-oscillations do not arise if water is irradiated beyond the oxygen absorption band and if the oxygen is removed from water. The wavelet transform analysis of luminescence records indicates that there are two characteristic periods of pulsations of about 300 and 1150 s. The results obtained suggest that auto-oscillations are triggered by photoinduced singlet oxygen (1)Δ(g), and this phenomenon is closely related to formation of hydrogen peroxide.

© 2011 American Chemical Society

PMID:
21595433
[PubMed - indexed for MEDLINE]
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