The Approach to Equilibrium in Fractionation

Bartky, W.; Dempster, A. J.

doi:10.1103/revmodphys.20.123

Cited by 2 publications

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“…Ours was not the fJrst effort to develop a doublefocusing mass spectrometer, although it was probably the first serious attempt to make precision atomic mass determinations with such an instrument. In 1933 Bondy and Popper [14) described a double-focusing mass spectrometer based on the calculations of Bartky and Dempster [15]. They employed the radial electric held in a 127°17' sector of a cylindrical condenser superimposed on a constant magnetic held to produce first-order direction and velocity focusing.…”

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confidence: 99%

The development of a high resolution mass spectrometer: A reminiscence

Nier

1991

J. Am. Soc. Mass Spectrom.

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This article is a review of the events leading to the development of the double-focusing tandem mass spectrometer system, which is sometimes called the Johnson-Nier geometry. An essential feature of the geometry is that it eliminates second-order angular aberration, enhancing the sensitivity, without a loss in resolution. Flexibility in the choice of ion source and collector designs is assured because both are outside of regions of electric and magnetic fields. The vacuum housing permits high-temperature baking, ensuring ultrahigh vacuum conditions. Although introduced initially for the purpose of determining precise atomic masses, the design has found its greatest application in studies of structure of heavy molecules, making use of the high resolution to identify fragments. In many cases the composition of a molecule, or fragment, can be deduced from its exact mass by utilizing the known atomic masses of likely constituent atoms.

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confidence: 99%