Axial TOF Mass Spectrometers

In axial TOF instruments all ions of charge q are first accelerated by a potential difference U, between the sample support and a nearby grid or open electrode, to 

for a given experiment the calibration equation is m/z = At, where A is the calibration constant which is determined by least-squares fitting of this equation to a series of peaks, the m/z values of which are known and the arrival times measured. However, in order to account for an electronic delay of the trigger signal 

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