reflectron

https://doi.org/10.1351/goldbook.11544
Component of a time-of-flight mass spectrometer that uses a static electric field to reverse the direction of travel of the ions and improves mass resolution by assuring that ions of the same m/z but different translational energy arrive at the detector at the same time.
Source:
PAC, 2020, 92, 1781. (Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)) on page 1843 [Terms] [Paper]