Article history: The paper summarizes original developments of gridless ion mirrors for high-resolution multi-reﬂection Received 25 November 2017 time-of-ﬂight mass spectrometers (MR TOF MS). Optimized mirror geometries and electrostatic ﬁeld Received in revised form distributions reach up to the 5th order isochronicity with respect to the energy spread and up to the 18 December 2017 3rd order full isochronicity per energy, spatial and angular spreads of ion packets. Using a retarding Accepted 7 January 2018 focusing ﬁeld at the mirror entrance doubles the ion transport energy at limited highest voltages. In Available online 12 January 2018 planar analyzers with a zig-zag ion path, quasi-planar mirrors eliminate the 2nd order dependence of the ﬂight time on the ion packet width in the drift direction. Improved MR TOF analyzers of 1 m size provide Keywords: well over one million aberration limit at realistic ion packets parameters past orthogonal accelerators. Flight time Because of high order isochronicity the aberration limit rapidly grows with the analyzer size or when Mass analyzer using narrower ion packets. In experiments, improved analyzers with one meter size demonstrate up to Ion mirror 300 000 mass resolving power at the full mass range and 500 000 at the
International Journal of Mass Spectrometry – Elsevier
Published: Mar 1, 2018
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