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

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

By J. D. Waldron (Eds.)

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Read 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 info 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

Sample text

If in addition the position of a Une image is first-order independent of velocity deviations (£), the instrument is said to be double-focusing. Just as all achromatic lenses in optics are made of at least two kinds of glass, all double-focusing mass spectrometers use both electric and magnetic fields. There are a great number of different manners in which the two fields may be combined; one of the simplest is to place in sequence an electric sector and a magnetic sector (tandem sectors). In this case the image of the source formed by the first sector becomes the object for the second sector.

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?

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. With the high resolution mass spectrographs now in use, I think it would be difficult to obtain narrower lines for practical reasons, but the intensity might be improved by a factor of ten.

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