Senko

M. Onoda, M. Ohtani, and K. Sanbonji, Tohoku Daigaka Senko Seiren Eenkyusho 21, 159 (1965). 

Istok JD, JM Senko, LR Krumholz, D Watson, MA Bogle, A Peacock, Y-J Chang, DC White (2004) In situ bioremediation of technetium and uranium in a nitrate-contaminated aquifer. Environ Sci Technol 38 468-475. 

Senko, M. W. Beu, S. C. McLafferty, F. W. Determination of monoisotopic masses and ion populations for large biomolecules from resolved isotopic distributions. J. Am. Soc. Mass Spectrom. 1995, 6,229-233. 

M.W. Senko, S.C. Beu and F.W. McLafferty, Automated assignment of charge states from resolved isotopic peaks for multiply charged ions, J. Am. Soc. Mass Spectrom., 6 (1995) 52-56. 

Senko, M.W. Sperr, J.P. McLafferty, P.W. Collisional Activation of Large Multiply Charged Ions Using PT-MS. Anal. Chem. 1994, 66, 2801-2808. 

Loo fA, Quinn JP, Ryu SI, Henry KD, Senko MW, et al. 1992. High resolution tandem mass spectrometry of large biomolecules. Proc Natl Acad Sci USA 89 286. 

Syka, J. E. P. Marto, J. A. Bai, D. L. Homing, S. Senko, M. W Schwartz, J. C. Ueberheide, B. Garcia, B. Busby, S. Muratore, T Shabanowitz, J. Hunt, D. F. Novel linear quadmpole ion trap/FT mass spectrometer performance characterization and use in the comparative analysis of histone H3 post-translational modifications. 

Chapter 6, by Clennan, on oxygenation in zeolites critically summarizes the results on oxidation of organic molecules within zeolites by singlet oxygen and superoxide anion. This chapter complements Chapter 6, Volume 5 by Va-senko and Frei. In addition to Chapter 6, Chapter 7 in this volume and Chapters 3, 4, and 5 in Volume 5 are exceptional resources in the area of excited-state behavior of organic molecules within zeolites. 

S. Nakazawa, Tohoku Daigaku Senko Seiren Kenkyusho Iho (Chem. Abstr., 1981, 37, 161). 

The two-dimensional (2-D) or linear ion trap (LIT) emerged in the 2000s as an effective alternative to the 3-D trap. Before 1995, linear traps were used primarily as ion storage/transfer/ion-molecule reaction devices in combination with FTICR (Senko et al., 1997 Belov et al., 2001), TOF (Collings et al., 2001), 3D ion trap (Cha et al., 2000), and triple-quadrupole (Dolnikowski et al., 1988) mass spectrometers because LITs offer better ion storage efficiencies in comparison to 3D quadrupole ion traps of the same dimensions (Hager, 2002 Schwartz et al., 2002). In 2002, commercial LITs were introduced as either stand-alone mass spectrometers (Schwartz et al., 2002) or as part of a triple quadrupole mass spectrometer (Hager, 2002). 

Homing, S. R., Fange, O., Wieghaus, A., Malek, R., and Senko, M. W. (2004). Simultaneous acquisition of two ion signals using two detectors in a hybrid ion trap/fourier transform ICR mass spectrometer. In Proceedings of the 52nd ASMS Conference on Mass Spectrometry and Allied Topics, Nashville, TN. 

Nawrocki, J. P., Wigger, M., Watson, C. H., Hayes, T. W., Senko, M. W., Benner, S. A., and Eyler, J. R. (1996). Analysis of combinatorial libraries using electrospray Fourier transform ion cyclotron resonance mass spectrometry. Rapid Commun. Mass Spectrom. 10 1860-1864. 

Top fragment ion obtained from ESI protonated Labetalol molecular ion in a triple quadrupole instrument. Centre same spectrum obtained in an ion trap with broadband excitation. All the ions, precursor or fragment, are activated by resonant irradiation. Bottom same spectrum as obtained with an ion trap when only the precursor ion is activated. Redrawn from Senko M.W., Cunniff J.B. and Land A.P., Producing "Richer" Product Ion Spectra on a Quadrupole Ion Trap with Broadband Activation , Proceedings of the 46th ASMS Conference on Mass Spectrometry and Allied Topics, Orlando, Florida, p. 486, 1998, with permission. 

Radial ejection between the rods has been described [19] but never applied to commercial instruments. Ejection through slots cut in two opposite rods was described first by Senko and Schwartz from Thermo Finnigan in 2002 [23,24],... 

Linear trap with slots cut in two opposite rods. Sizes are 12 mm for sections A and C and 37 mm for B. Detectors D are placed off-line and ions are attracted by the conversion dynodes. The slots are 30 x 0.25 mm. Drawn according to the data from Schwartz J.C., Senko M.W. and Syka J.E.P., A Two-Dimensional Quadrupole Ion Trap Mass Spectrometer , Proceedings of the 50th ASMS Conference on Mass Spectrometry and Allied Topics, Orlando, Florida, 2002. 

High-resolution FT ICR mass spectrum of ubiquitin. The upper trace displays the detail of the peak at 952.5 Th. The distance of 0.11 Th between the isotopic peaks allows one to deduce that the charge is 9. This spectrum was obtained with 5 amol of ubiquitin. Reproduced from Kelleher N.L., Senko M.W., Little D., O Connor P.B. and McLafferty F.W., J. Am. Soc. Mass Spectrom., 6, 220, 1995, with permission. 

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