Advances in Mass Spectrometry. Proceedings of a Joint by J. D. Waldron (Eds.)

By J. D. Waldron (Eds.)

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Example text

A) who obtained resolving powers close to the theoretical limits. The fields in Alekseevski's 180° sector type-instruments were shaped according to equation (1) and first order direction focusing was obtained. With a very narrow object slit, the image in such an arrangement is broadened for two reasons. Firstly the ions are selected according to their momentum mv rather than according to their mass m alone. This is a property which is common to all arrangements using only a magnetic analyser. The initial energies of the ions and the potential distribution in the ion source result in an energy spread in the ion beam, which broadens the image.

13. , WENDE, H. and KÕNIG, L. , Z. Naturforsch, 10a, 605 (1955). (Correction to ref. 9) Z. Naturforsch, 12a, 88 (1957). 14. ROBINSON, C. , Rev. Sci. Instr. 28, 777 (1957). 15. HINTENBERGER, H. and KÕNIG, L. , Nuclear Instruments, 3, 250 (1958). DISCUSSION G. H. PALMER : Professor Hintenberger, these instruments with complete second order focusing are very complicated to calculate and not easy to construct. Could you say what improvement in resolution could be obtained, theoretically, compared to a straightforward Mattauch-Herzog instrument and how well this might be achieved in practice?

14. ROBINSON, C. , Rev. Sci. Instr. 28, 777 (1957). 15. HINTENBERGER, H. and KÕNIG, L. , Nuclear Instruments, 3, 250 (1958). DISCUSSION G. H. PALMER : Professor Hintenberger, these instruments with complete second order focusing are very complicated to calculate and not easy to construct. Could you say what improvement in resolution could be obtained, theoretically, compared to a straightforward Mattauch-Herzog instrument and how well this might be achieved in practice? H. HINTENBERGER: YOU can obtain either more intensity or more resolution.

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