Device to shorten the time length of a pulse of ions so that they arrive at a point over a reduced time interval.
Note: The point is usually the sample surface.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1837 (https://doi.org/10.1515/pac-2019-0404)