collision cell

https://doi.org/10.1351/goldbook.12361
Chamber in the ion path between m/z separation elements, or between ion source acceleration region and the first analyzer, in tandem mass spectrometry in space configurations.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1531 [Terms] [Paper]