Radiant energy – Ionic separation or analysis – With sample supply means
Reexamination Certificate
2005-04-07
2008-12-02
Berman, Jack I. (Department: 2881)
Radiant energy
Ionic separation or analysis
With sample supply means
Reexamination Certificate
active
07459675
ABSTRACT:
An improved ionization source for a mass spectrometer is constructed of a subsurface of metal that has a smooth surface obtained by, for example, electropolishing, and an inert surface thin enough to have a surface finish opposing the subsurface that replicates that of the subsurface. Preferably the inert surface has a thickness that is less than 0.001 inches and is gold. Operation of a mass spectrometer with the improved ionization source results in reduced adsorption and reduced reactions between charged molecules or ions and metallic surfaces. Micro-machining of the subsurface metal before electropolishing enhances smoothness and decreases resulting debris collection on the improved ionization source. The improved ionization source remains serviceable for longer periods and is easier to clean and recondition for continued use as compared to known mass spectrometer ionization sources.
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Berggren William R.
Berman Jack I.
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