Ion detection system

An ion detection system comprising:

• one or more first devices configured to produce secondary electrons in response to incident ions, the one or more first devices comprising a first ion collection region and a second ion collection region, wherein the one or more first devices are configured to produce first secondary electrons in response to one or more ions incident at the first ion collection region and to produce second secondary electrons in response to one or more ions incident at the second ion collection region;
• a first output device configured to output a first signal in response to first secondary electrons produced by the one or more first devices;
• a second output device configured to output a second signal in response to second secondary electrons produced by the one or more first devices;
• a digitiser configured to digitise the first signal to produce a first digitised signal;
• a digitiser configured to digitise the second signal to produce a second digitised signal;
• processing circuitry configured to determine first intensity and arrival time, mass or mass to charge ratio data from the first digitised signal;
• processing circuitry configured to determine second intensity and arrival time, mass or mass to charge ratio data from the second digitised signal;
• and
• processing circuitry configured to combine the first intensity and arrival time, mass or mass to charge ratio data and the second intensity and arrival time, mass or mass to charge ratio data to form a combined data set.