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Significant systematic errors in high-precision Penning trap massspectrometry can result from electric and magnetic field imperfections. Anexperimental procedure to minimize these uncertainties is presented for theon-line Penning trap mass spectrometer ISOLTRAP, located at ISOLDE/CERN. Thedeviations from the ideal magnetic and electric fields are probed by measuringthe cyclotron frequency and the reduced cyclotron frequency, respectively, ofstored ions as a function of the time between the ejection of ions from thepreparation trap and their capture in the precision trap, which influences theenergy of their axial motion. The correction parameters are adjusted tominimize the frequency shifts.

Electric and magnetic field optimization procedure for Penning trap mass spectrometers