An algorithm for correcting systematic energy deficits in the atom probe mass spectra of insulating samples

Improvements in the mass resolution of a mass spectrometer directly correlate to improvements in peak identification and quantification. Here, we describe a post-processing technique developed to increase the quality of mass spectra of strongly insulating samples in laser-pulsed atom probe microscopy. The technique leverages the self-similarity of atom probe mass spectra collected at different times during an experimental run to correct for electrostatic artifacts that present as systematic energy deficits. We demonstrate the method on fused silica (SiO₂) and neodymium-doped ceria (CeO₂) samples which highlight the improvements that can be made to the mass spectrum of strongly insulating samples.