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Detector counting rate nonlinearity, though a known problem, is commonlyignored in the analysis of angle resolved photoemission spectroscopy wheremodern multichannel electron detection schemes using analog intensity scalesare used. We focus on a nearly ubiquitous "inverse saturation" nonlinearitythat makes the spectra falsely sharp and beautiful. These artificially enhancedspectra limit accurate quantitative analysis of the data, leading to mistakenspectral weights, Fermi energies, and peak widths. We present a method torapidly detect and correct for this nonlinearity. This algorithm could beapplicable for a wide range of nonlinear systems, beyond photoemissionspectroscopy.

Effects, Determination, and Correction of Count Rate Nonlinearity in Multi-Channel Analog Electron Detectors