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10 April 1995 Mass spectrometric study of gas-phase oxidation reactions during laser ablation of YBaCuO
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The gas-phase processes relevant for oxidation during Nd:YAG laser ablation of YBaCuO superconductor in vacuum and in an oxygen environment are investigated by mass spectrometry used in conjunction with molecular beam technique. The dynamics of monoxides YO and BaO as well as small clusters formation are analyzed. To separate the processes involving ablated and ambient oxygen, argon ambient atmosphere is also used. In vacuum, the oxidation is caused predominantly by interaction of low velocity portions of ablated Y and Ba atoms with the ablated oxygen which is mostly realized, at the laser fluences used (3-5 J/cm2), in atomic form. In oxygen background, efficient formation of oxides and oxygen-contained clusters is observed at all expansions stages. The pressure dependence of the atomic and oxide fluxes for the high velocity species has been described as an attenuation of molecular beam due to reactive and elastic scattering, and thus the cross section for oxidation reactions have been estimated. Hydrodynamic effects are found to have a significant influence on the oxidation processes within the plume. In argon background, oxide fractions decrease with the pressure due to dilution of the ablated oxygen flux.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexander V. Bulgakov "Mass spectrometric study of gas-phase oxidation reactions during laser ablation of YBaCuO", Proc. SPIE 2403, Laser-Induced Thin Film Processing, (10 April 1995);

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