A mass analyzing system for time-of-flight ("TOF") mass spectrometry analysis, the system coupleable to a pulsed ion source providing a first, pulsed ion beam having an input TOF focus, the system comprising: an electrostatic mirror prism arrangement comprising: a first electrostatic mirror prism (150 1 ) having a first plurality of electrodes to generate a first retarding electric field to reflect the first ion beam and provide a second, intermediate ion beam having a spatial dispersion of ions proportional to ion kinetic energies, the second ion beam having an intermediate second TOF focus ; and a second electrostatic mirror prism (150 2 ) spaced apart from the first electrostatic mirror prism (150 1 ) by a first predetermined distance and further arranged to have a predetermined first angular offset from the first electrostatic mirror prism (150 1 ), the second electrostatic mirror prism (150 2 ) having a second plurality of electrodes to generate a second retarding electric field to reflect the second ion beam and converge the spatial dispersion of ions to provide a third, recombined ion beam , the third ion beam having a third output TOF focus ; and an ion detector arranged at the output TOF focus to receive the third ion beam , the ion detector adapted to detect a plurality of ions of the third ion beam . an electrostatic mirror prism arrangement comprising: a first electrostatic mirror prism (150 1 ) having a first plurality of electrodes to generate a first retarding electric field to reflect the first ion beam and provide a second, intermediate ion beam having a spatial dispersion of ions proportional to ion kinetic energies, the second ion beam having an intermediate second TOF focus ; and a second electrostatic mirror prism (150 2 ) spaced apart from the first electrostatic mirror prism (150 1 ) by a first predetermined distance and further arranged to have a predetermined first angular offset from the first electrostatic mirror prism (150 1 ), the second electrostatic mirror prism (150 2 ) having a second plurality of electrodes to generate a second retarding electric field to reflect the second ion beam and converge the spatial dispersion of ions to provide a third, recombined ion beam , the third ion beam having a third output TOF focus ; and a first electrostatic mirror prism (150 1 ) having a first plurality of electrodes to generate a first retarding electric field to reflect the first ion beam and provide a second, intermediate ion beam having a spatial dispersion of ions proportional to ion kinetic energies, the second ion beam having an intermediate second TOF focus ; and a second electrostatic mirror prism (150 2 ) spaced apart from the first electrostatic mirror prism (150 1 ) by a first predetermined distance and further arranged to have a predetermined first angular offset from the first electrostatic mirror prism (150 1 ), the second electrostatic mirror prism (150 2 ) having a second plurality of electrodes to generate a second retarding electric field to reflect the second ion beam and converge the spatial dispersion of ions to provide a third, recombined ion beam , the third ion beam having a third output TOF focus ; and an ion detector arranged at the output TOF focus to receive the third ion beam , the ion detector adapted to detect a plurality of ions of the third ion beam . <EOS>