The Pd thin film sample had a native oxide layer. The spectrum was recorded with Al Kα irradiation. I cant identify the origin of the sub-peak at ~1150eV (green line). From my understanding it cant be a plasmon peak as these are on the higher binding energy side and it cant be another Pd peak, as lower energy orbitals have higher binding energy as Al Kα can provide. Can it be another oxygen Auger peak? I cant find anything in the literature besides the O KLL peak...
Thanks!
Pd is known to have shake-up satellites in XPS, maybe there is a similar physics behind this effect?
This is just the shape of the Pd MNN. Auger peaks are not like core level ones where you have a single symmetric (usually) peak. The shape of the auger peaks is generally complex and consists of many features. I suggest you'd have a look at this paper (Article XPS, AES and auger parameter of Pd and PdO
), where you can see that the feature you're looking for is there even for the pristine metal. Moreover, the fitting you have performed is not accurate because the two peaks you have fitted are not due to the oxide, but are also present in the metal.
I remember a paper dealing with Auger peak deconvolution of silver, and Pd should in principle behave similarly. And there, you'll also find at least 4 peak transitions for the mnn auger… that would correspond well to Charalampos answer. Cheers, Dirk
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