By Peter V. Raven. Xiaoqing Huang, Ben B. Kim
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Mass analysis in this way takes less than a tenth of a second, and the resolution obtained is comparable to that of a quadrupole. However, it is possible to scan very slowly over a small mass window (a process known as the ‘zoomscan’), and this approach allows high resolution (up to 5000) to be obtained. By increasing the time which ions of a particular mass spend in the ion trap the resolution can be considerably improved as the relative energies of ions with the same m/z become closer in value.
F. G. Johnson, J. S. McIndoe and P. R. R. Langridge-Smith, Rapid Commun. , 2000, 14, 311; P. J. Dyson, A. K. Hearley, B. F. G. Johnson, J. S. McIndoe, P. R. R. Langridge-Smith and C. Whyte, Rapid Commun. , 2001, 15, 895; C. P. G. Butcher, P. J. Dyson, B. F. G. Johnson, P. R. R. Langridge-Smith, J. S. McIndoe and C. Whyte, Rapid Commun. , 2002, 16, 1595. 10. P. J. Dyson, A. K. Hearley, B. F. G. Johnson, T. Khimyak, J. S. McIndoe and P. R. R. LangridgeSmith, Organometallics, 2001, 20, 3970. 11. A.
The desorbed ions do have a range of velocities, which has a negative effect on the attainable resolution. This problem has been largely overcome by a technique called delayed extraction, where after a short delay a pulsed electric ﬁeld accelerates the ions furthest from the desorption surface least (because these ions must have the highest velocity) and those closest most. 1 Reﬂectron Instruments The ions leaving the ion source of a time-of-ﬂight mass spectrometer have neither exactly the same starting times nor exactly the same kinetic energies.