SF_6放電生成物によるオゾン破壊のレーザー分光研究(2)

概要

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This paper will report the SF_6 gas, decomposed by UV irradiation at the stratosphere, may destruct the ozone (O_3) layer as the same as the Freon gas. SF_6 gas absorbs very strongly the 10.6μm P branch of CO_2 laser beam, while O_3 has the unique absorption spectrum with a sharp valley at the center of the 9.6μm P branch. So, we can easily observe the production rate of ozone after long discharge over 30 minutes of oxygen (O_2) by the laser photo-acoustic measurement of the valley depth. First, we could recognize the depth of O_3 spectrum decreased remarkably when the O_2 gas mixed with the Freon R-22 was discharged as the same. Secondly, we found both the same depth reduction and a new absorption spectra at the red side of the 9.6μm P branch after 1.5 hours 1Hz-pulsed discharge of O_2 gas mixed with SF_6. We have already observed the new absorption spectra resulted from the decomposed molecules, such as SF_2O_2, after the long discharge of SF_6 gas. Thus, it will be concluded the ozone layer may be destroyed by the SF_6 decomposition products due to UV irradiation at the stratosphere.
福井大学の論文
2004-03-31