By J. D. Waldron (Eds.)
Read Online or Download Advances in Mass Spectrometry. Proceedings of a Joint Conference Organised by the Hydrocarbon Research Group, Institute of Petroleum, and A.S.T.M. Committee E.14 and Held in the University of London, 24th–26th September, 1958 PDF
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Extra resources for Advances in Mass Spectrometry. Proceedings of a Joint Conference Organised by the Hydrocarbon Research Group, Institute of Petroleum, and A.S.T.M. Committee E.14 and Held in the University of London, 24th–26th September, 1958
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Nuclear Instruments, 3, 133 (1958). 6. MATTAUCH, J. , Z. Phys. 89, 786 (1934). 7. VOORHIES, H. , Rev. Sci. Instr. 26, 716 (1955), 27, 58 (1956). 8. 9. 10. 11. EWALD, H. , Z. Naturforsch, 10a 872 (1955). H. , Z. Naturforsch, 12a, 538, 541 (1957). HINTENBERGER, H. and KÕNIG, L. , Z. Naturforsch, 11a, 1039 (1956). KÕNIG, L. , Z. Naturforsch, 12a, 377 (1957). 12. TASMAN, H. , This volume, p. 36. 13. , WENDE, H. and KÕNIG, L. , Z. Naturforsch, 10a, 605 (1955). (Correction to ref. 9) Z. Naturforsch, 12a, 88 (1957).
In the source these alterations by the ions of one mass influence the sensitivity of the source to ions of another mass (or sample component). This is one cause of the phenomenon often called interference. It limits the linearity with which currents due to one sample component will be [superimposed upon those due to another component, and this limits the analytical accuracy of the instrument. In the analyser, space charge in the beam causes the ions near the periphery to be repelled from the axis.
Thus the instrument is more compact than a single focusing one with the same magnet. Because the electric field is in the direction of the centrifugal force, the radial forces are in balance for an ion velocity lower than that required with the magnetic field alone. In fact, the ions move at half speed, making the energy only one-fourth as HIGH-MASS HIGH-RESOLUTION MASS SPECTROMETERS 51 much. From the standpoint of power supply capability, this is an advantage; on the other hand, it makes the instrument more vulnerable to surface charge effects.