has proper continuant part at some time reflectron time-of-flight mass spectrometer reTOF-MS reTOF MS A mass spectrometer which uses a time-of-flight mass-to-charge analyser and a reflectron to separate ions. The reflectron uses a constant electrostatic field to reflect the ion beam toward the detector. The more energetic ions penetrate deeper into the reflectron, and take a slightly longer path to the detector. Less energetic ions of the same charge-to-mass ratio penetrate a shorter distance into the reflectron and, correspondingly, take a shorter path to the detector. CHMO:0000977 reflectron TOF MS reflectron time-of-flight mass-to-charge analyser time-of-flight mass spectrometer mass spectrometer