Abstract
In the present work, the YBa 2Cu 3O 7−x surface and its reactivity with the residual vacuum at room temperature has been characterized using electron-stimulated desorption, ESD, and Auger electron spectroscopy, AES. The samples were prepared by sintering component oxides under pressure. The AES spectra revealed C and Cl as the most usual contaminants. ESD experiments show, in addition to the expected O + surface ions, H +, F +, and Cl +. H + surface ions are more intense than the expected O + surface ions. Thermal cleaning of the sample is rather difficult due to the high porosity of the samples yielding extremely high gas loads. The intensity of the hydrogen species yielding H + are in equilibrium with the H 2 pressure in the system up to a pressure of 10 −9 mbar, beyond which the uptake remains constant.
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