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Effects of pulsed low frequency electromagnetic fields on water using photoluminescence spectroscopy: role of bubble/water interface

机译：脉冲低频电磁场对水的影响，使用光致发光光谱：气泡/水界面的作用

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The effects of a pulsed low frequency electromagnetic field were investigated on photoluminescence of well characterized water and prepared under controlled conditions (container, atmospheric, electromagnetic, and acoustic environments). When reference water samples were excited at 260 nm, two wide emission bands centered at 345 nm (3.6 eV) and 425 nm (2.9 eV) were observed. By contrast under 310 nm excitation, only one band appeared at 425 nm. Interestingly, electromagnetic treatment (EMT) induced, at both excitation wavelengths, a decrease (around 70%) in the 425 nm band relative photoluminescence intensity. However, no difference between reference and treated sample was observed in the 345 nm band. Other experiments, performed on outgassed samples (reference and treated), show that the emission bands (position, shape, intensity) under excitation at 260 nm and 310 nm were similar and close to the corresponding bands of the treated nonoutgassed samples. Similar effects were observed on photoluminescence excitation of water samples. Two excitation bands monitored at 425 nm were observed at 272 nm and 330 nm. After EMT and/or outgassing, a decrease (> 60%) was observed in the intensity of these two bands. Altogether, these results indicate that electromagnetic treatment and/or outgassing decrease in a similar fashion the photoluminescence intensity in water samples. They also suggest that this effect is most likely indirectly attributed to the presence of gas bubbles in water. The possible role of hydrated ionic shell around the bubbles in the observed extraluminescence is discussed.
机译：研究了脉冲低频电磁场对良好表征的水的光致发光的影响，并在受控条件下（容器，大气，电磁和声学环境）对其进行了制备。当参考水样品在260 nm激发时，观察到两个以345 nm（3.6 eV）和425 nm（2.9 eV）为中心的宽发射带。相比之下，在310 nm激发下，仅一个波段出现在425 nm。有趣的是，在两个激发波长下，电磁处理（EMT）都会导致425 nm波段的相对光致发光强度降低（约70％）。但是，在345 nm波段中未观察到参考样品与处理后样品之间的差异。在脱气样品（参考样品和处理样品）上进行的其他实验表明，在260 nm和310 nm激发下的发射带（位置，形状，强度）相似，并且接近处理后的非脱气样品的相应谱带。在水样品的光致发光激发中观察到类似的效果。在272 nm和330 nm处观察到在425 nm处监测到的两个激发带。在EMT和/或放气后，观察到这两个谱带的强度降低（> 60％）。总而言之，这些结果表明电磁处理和/或除气以类似的方式减少了水样品中的光致发光强度。他们还暗示，这种影响很可能间接归因于水中气泡的存在。讨论了气泡周围水合离子壳在观察到的外发光中的可能作用。

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