Method and apparatus for mass analysis using slow monochromatic

Details Method and apparatus for mass analysis using slow monochromatic Method and apparatus for mass analysis using slow monochromatic

1992-05-18

1994-08-23

Berman, Jack I.

Radiant energy

Ionic separation or analysis

250282, 250288, 250427, H01J 4914

Patent

active

053409833

ABSTRACT:
Methods and apparatuses are disclosed for mass-analysis of a sample for particular analytes of interest. An electron monochromator is coupled to any of a number of different types of mass analyzer and used to generate slow electrons used to produce ions of target molecules for mass analysis. The electrons have a narrow energy bandwidth and high intensity, even at nearly zero kinetic energy levels. The median energy level of the electrons can be preset, permitting selection of specific target molecules to be ionized. Both positive and negative-ion mass analysis can be performed. Electron-capture negative-ion mass spectrometry is particularly enhanced, with a sensitivity about three orders of magnitude greater than in results obtained using conventional negative-ion equipment. Also, a buffer gas is eliminated, allowing substantial reductions in negative-ion equipment size, weight, and energy consumption. The mass analyzer can be an ion trap, making possible sensitive analysis of low concentrations of chemical analytes, such as environmental contaminants, using a hand-held instrument. Multiple mass analyzers, or combinations of a mass analyzer with other analytical instruments such a gas chromatograph, can be coupled to the electron monochromator.

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