Organic Syntheses by Yates P., Benson R.E., Eschenmoser A. (eds.)

By Yates P., Benson R.E., Eschenmoser A. (eds.)

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Naturally, the ions will eject over a distribution of times owing to their differences in position, trajectory, and velocity. However, if some ions also undergo a collision with a He atom shortly before ejection, they may perhaps lose enough KE (by conversion to IEion) to eject a cycle or two later than expected, causing a bit broader distribution of peak width. However, if the analyte ions instead collide with N2, they could assume a still broader distribution of position/trajectory/ velocity and subsequently eject over an even longer time period (poorer resolution than the He case).

20 INTRODUCTION TO MASS SPECTROMETRY popular instruments valued for their high resolution, mass accuracy, and sensitivity. Today, commercial TOF-based instruments are capable of providing resolutions of >10,000, mass accuracies of a few ppm, and the capability for performing MS/MS. The interested reader is referred to a few recent reviews for further details on TOF-MS than those provided here [54–59]. 602 Â 10À19 C), and Vaccel is the potential through which the ions are accelerated (in volts).

The remaining analyzer types (magnetic sectors, quadrupole filters, and TOFs) require tandem-in-space configurations, where two or more analyzers are used; the typical setup involves a first analyzer performing the target ion selection and a second analyzer performing the analysis, with an intermediate “collision cell” in place to effect the activation. Magnetic sectors can perform target ion isolation by adjustment of field strengths such that only the m/z of interest can be passed through a narrow slit and onward to a collision cell or/and the next stage of mass analysis.

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