Advances in Mass Spectrometry. Proceedings of a Joint - download pdf or read online

By J. D. Waldron (Eds.)

ISBN-10: 0080092101

ISBN-13: 9780080092102

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Additional 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

Example text

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). 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.

General expressions for these coefficients have been derived by Hintenberger and Konig(5). First order direction focusing is accomplished if B1 = 0 ; first order velocity focusing occurs if B2 = 0. As might be expected, the coefficients Bx and B2 do not depend on the second order field shape parameter X. For a chosen set of values of the parameters W9 n9 re\rm> e9 d\rm> a value of re/re and of l"m\rm can be found which makes B1= B2= 0, thus resulting in first order double focusing for the median plane.

However, the position of the final image is directly related to the absolute intensity of both the electric and the magnetic fields. For all instruments the incremental beam width, A BW, resulting from a fractional variation of the magneticfield,AB/B, is given by ABW = 2rmAB/B. ) The fractional deviation in the electric field AEjE similarly moves the image and produces an incremental beam width BW = reAE/E* For the cycloid, re becomes the focal distance. The above relations impose a rather strict limitation on the permissible ripple which can be tolerated in the fields.

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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 by J. D. Waldron (Eds.)


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