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By J. D. Waldron (Eds.)

ISBN-10: 0080092101

ISBN-13: 9780080092102

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Extra 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

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HINTENBERGER AND L. A. KÕNIG FIG. 7. Examples of mass spectrographs with corrected a-dependent image defects (Bn = B12 = 0, Bu i= 0). Deflection in the electric and the magnetic field in the same sense. (See Table IV, No. u = B12 = 0, B22 # 0). 22 VMte e No. No. 210 210 210 230 230 230 240 240 250 250 250 148-49 148-491 1-938 1-938 148-49 1-219 162-63 1-272 162-63 1-224 162-63 0-886 169-71 1-157 169-71 0-817 176-78 1-027 176-78 0-961 176-78 0-775 1-119 1-119 0-635 1-323 1-236 0-778 1-331 0-810 1-478 1-275 0-896 1-370 1-370 0-778 0-785 0-733 0-462 0-543 0-331 0-380 0*328 0-231 0-159 0-159 0-159 0159 0-077 0077 00-077 077 0-077 0077 0-184 0-184 0184 0-102 0102 0-102 0102 0-102 0102 -—1-107 1107 -1-153 -1-993 -1-993 -2-031 --2-191 2191 -1*939 -2-103 -2-103 -2-048 -2-048 -2-182 -2-182 -2-380 FIG.

9. Examples of mass spectrograph with corrected j8-dependent image • defects (B12 = B22 = 0, Bu ^ 0). Deflection in the electric and the magnetic field in the same sense. (See Table VI, No. 5 and 10) TABLE VI Mass spectrographs with corrected 0-dependent image defects in one point of the photoplate (B12 = B22 = 0, Bu # 0). Deflection in the electric and the magnetic field in the same sense e" €' rmIR' h/(2)0j No. 0m No. €' e" rm/R' re\rm \l'e\r Tm/A-wm BBnn V(2)ct>e

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. This effect is of first order, as it is proportional to the relative velocity spread p as defined by: v = v¿\+f$) (3) By choosing a high acceleration voltage, j8 can be reduced.

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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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