I did a NAP-XPS experiment on pure SnO2 and dosed it with pure O2 at different pressures and temperatures, looking for O adsorbate species at BE range of 531-533 eV. I got some amazing results - huge peak at ~532-533 eV, but then I noticed peaks emerging at 103 and 155 eV (bang on Si peaks)
HOWEVER! The Si peaks disappear almost completely when pumping down to UHV or increasing the temperature up to 200 oC in 1 mbar O2.
Has anyone ever heard of evaporating silica? What about dissolving in SnO2? And how it would dissolve so fast that it’s not registered by the XPS survey? Could the peaks at 103 and 155 eV come from anything else? Survey was done at 1200.0 eV photon energy at Diamond Light Source B07 beamline.
Thanks for your help!
Artur Braun There is no C 1s signal in the survey, even when the Si peaks are as large as the Sn 3d and O 1s peaks, so it can't be carbonaceous. :(
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