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By J. D. Waldron (Eds.)

ISBN-10: 0080092101

ISBN-13: 9780080092102

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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

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FIG. 6. Mattauch-Herzog type mass spectrograph with second-order direction focusing at one point of the photoplate (P0) If the mixed angle- and velocity-dependent aberration or the pure velocity-dependent aberration is to be corrected, then in addition to B^ = B2 = 0 the conditions B12 = 0 or B22 = 0 must also be satisfied. Both of these last two equations can be solved in terms of the distance d between the electric and magnetic fields, so that by a suitable choice of d in double focusing mass spectrographs, the image defect depending on ocf$ or £2 disappears, in addition to achieving double focusing of first order for all masses.

Substitution of such a physically significant set of values for the parameters W9 n, re\rmy e, d¡rm, together with the values of l'e/re and rm/rm which make B1= B2= 0, into the expressions for Bn, B129 and B22, give the latter coefficients as linear functions of X9 so that elimination of the second order angular aberration (Bn = 0) is possible in a straightforward manner. SECOND ORDER ABERRATIONS IN INHOMOGENEOUS FIELDS 41 Generally, the value of X which makes Bn = 0, will give B12 and B22 a finite value.

This paper is concerned solely with mass spectrometers which form focused ion beams and use resolving slits for mass separation. This kind of mass spectrometer has many properties in common with optical instruments. The source slit is actually focused on the mass resolving slit. An essential part of such an instrument is the magnetic field, which sorts the ions into beams of equal momenta. When the ion beam incident upon the magnetic sector is of nearly homogeneous energy, the resultant spectrum is mass dependent.

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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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