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

For mass spectrometers of a given configuration the transit time is proportional to m\B and is independent of the instrument radius. This phenomen has been discussed by Berry*21). PART II DESCRIPTION OF EXPERIMENTAL INSTRUMENTS During the past few years we have built and operated in our laboratory three different kinds of mass spectrometers with moderately high resolving power: (a) a 60° coincident field sector instrument (Figs. 2 and 3); (b) a tandem sector instrument (Figs. 6 and 7); (c) a coincident field cycloid instrument (Figs.

Thus, X(a9 p)/rm = A2Qa2 + Anap + A02fi2 There is an extensive literature on second order aberrations. Of particular interest is a paper by Hintenberger and Konig<6> in which conditions are given for tandem instruments in order to make A20, Am and A02 equal to zero for a single mass. The less complete theory of Johnson and Nier<4> and of Voorhies<17> is adequate for the treatment of the sector instruments described in this paper. Hintenberger, Wende, and Konig<5> give conditions for first order double-focusing for all masses simultaneously with A20 = 0 for one mass.

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.

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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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