Multiple-ion-ejection multi-reflection time-of-flight mass spectrometry for singlereference mass measurements with lapping ion species Review of Scientific Instruments 91, 023201 (2020);
A time-dependent postextraction differential acceleration (PEDA) potential was used to
temporally focus increasingly heavy ions in a stigmatic imaging mass spectrometer,
allowing them to be imaged with high mass and spatial resolutions over a broad
mass-to-charge (
m
/
z
) range. By applying a linearly
rising potential to the ion extraction electrode, sequential
m
/
z
ratios were subjected to a changing electric
field, allowing their foci to coincide at the detector. Using this approach, at least
75% of the maximum mass resolution was obtained over a 300–600 Da range when the
ion microscope was focused around 450 Da, representing more than a 10-fold increase over
the conventional single-field PEDA method.
Ion microscopy allows for high-throughput mass spectrometry imaging. In order to resolve congested mass spectra, a high degree of timing precision is required from the microscope detector. In this paper we present an ion microscope mass spectrometer that uses a Timepix3 hybrid pixel readout with an optimal 1.56 ns resolution. A novel triggering technique is also employed to remove the need for an external time-to-digital converter (TDC) and allow the experiment to be performed using a low-cost and commercially available readout system. Results obtained from samples of rhodamine B demonstrate the application of multimass imaging sensors for microscope mass spectrometry imaging with high mass resolution.
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