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photoemission Peaks have an underlying line shape however measured spectra have line shapes that depend on the underlying line shape of the photoemission peak but also on the acquisition conditions in this example we have four spectra that will all measure from the same sample using the same pass energy the difference between these data are the size of a selected area aperture if we use a full slot aperture then the full etaf maximum is about to evey however if we use a 15 micron aperture which is docHubly narrower than this slot aperture then the full width half maximum is not 0.8 so despite having a common underlying line shape we need to understand how an instrument is changing the shape of the peaks so that we can do a proper analysis in terms of the chemical state that is due to the sample and not due to artifacts of the measurement process itself the variation we see in these line shapes is due to variation in an aperture and the aperture is altering the quality and the quan
