Research

X. Liu, X. Wang, P. Bu, X. Zhou and O. Zheng; "Tandem Analysis by a Dual-Trap Miniature Mass Spectrometer", Analytical Chemistry, 2019, 91, 1391-1398.

https://doi.org/10.1021/acs.analchem.8b03958

Miniature mass spectrometers are of an increasing interest for in-situ analyses, and their coupling with the ambient ionization sources is a valid path for direct analysis of complex samples. In this study, a miniature mass spectrometer using discontinuous atmospheric pressure interface was developed with a dual-LIT (linear ion trap) configuration. The comprehensive scan modes were enabled for tandem mass spectrometry analysis, which are critical for high-quality qualitative and quantitative analysis. A real-time pressure control was implemented to facilitate the ion transfer and collision induced dissociation (CID). Beam-type CID could be performed for tandem analysis at a high number of stages. In-trap CID at high q could also be performed with the fragment ions accumulated in a second trap. A precursor ion scan mode for analyzing target analytes has also been demonstrated.