Role of interstitial voids in oxides on formation and stabilization of reactive radicals: interstitial HO2 radicals in F2-laser-irradiated amorphous SiO2

Journal of the American Chemical Society
Koichi KajiharaH Hosono

Abstract

A procedure to produce stable hydroperoxy radicals (HO*2) in bulk amorphous SiO(2) (a-SiO(2)) has been developed. Oxygen molecules incorporated in the interstitial voids in a-SiO(2) react with mobile hydrogen atoms (H(0)) generated by the photolysis of silanol (SiOH) groups with F(2)-laser light (lambda = 157 nm, hnu = 7.9 eV), resulting in the efficient creation of interstitial HO*2. The high yield of HO*2 suggests that the collisions of the reaction intermediate with the void wall play an important role in dissipating the excess energy of the intermediate instead of the triple collision observed in the gas phase reaction. The resultant HO*2 is thermally stable up to 100 degrees C.

References

Oct 1, 1992·Physical Review. B, Condensed Matter·H NishikawaY Hama
Aug 30, 2001·Journal of the American Chemical Society·L KhriachtchevM Räsänen
Sep 13, 2002·Physical Review Letters·Koichi KajiharaHideo Hosono

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Citations

May 26, 2006·The Journal of Physical Chemistry. B·Koichi KajiharaHideo Hosono

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