Discontinuous atmospheric pressure interface (DAPI), consisting of a pinch valve, a silicone tube, and two metal capillaries, is a common inlet for miniature ion trap mass spectrometers (ITMS). It can improve the transport efficiency while help the miniaturization of the mass spectrometers.
Click here for original story, Scientists discover triboionization in discontinuous atmospheric pressure inlet for miniature ion trap mass spectrometer
Source: Phys.org