A two-dimensional quadrupole ion trap mass spectrometer

By J. Schwartz, M. Senko, J. Syka. Journal of the American Society for Mass Spectrometry, 2002

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Exponentially Modified Protein Abundance Index (emPAI) for Estimation of Absolute Protein Amount in Proteomics by the Number of Sequenced Peptides per Protein*S (2005, methodology): “The scan cycle was 1.19 s for one MS and 1.17 s for one MS/MS on average in LCQ and 0.17 s for one MS and 0.38 s for one MS/MS on average in LTQ.”
Comparative evaluation of mass spectrometry platforms used in large-scale proteomics investigations (2005, background): “The LTQ, a recently commercialized linear (two-dimensional) QIT mass spectrometer (2D-QIT), has higher ion capacity and scan rates than traditional three-dimensional ion trap”
Decision Tree-Driven Tandem Mass Spectrometry for Shotgun Proteomics (2008, background): “QITs provide unmatched sensitivity and high scan cycle times (spectra per second) at unit m/z resolving powe”
Proteomics by mass spectrometry: approaches, advances, and applications. (2009, background): “The LTQ ion trap (54) from Thermo Scientific combines a tenfold-higher ion storage capacity than 3D traps and high resolution at a fast scanning rate (5555 Da s−1).”