High intensity ion source apparatus for mass spectrometry
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United States of America Patent
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Jul 1, 2003
Grant Date -
N/A
app pub date -
Apr 12, 2000
filing date -
Apr 12, 1999
priority date (Note) -
Expired
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Abstract
A high intensity ion source for a mass spectrometer is provided having system dimensions and parameters which cause the Taylor cone of a liquid charge stream to pass through an aperture in a lens into a low pressure chamber without substantially desolvating. A capillary tube having an outlet diameter on the order of 50 micrometers is located in an ion source chamber which is maintained at close to atmospheric pressure. The outlet of the capillary tube is positioned at a distance on the order of 250 micrometers from the aperture of the lens. The low pressure chamber is maintained at a pressure on the order of 13 pascals. With a suitable applied field, a Taylor cone ion stream is formed and passes through the aperature in the lens into a low pressure chamber without substantially desolvating. Substantial desolvation of the liquid charge stream is accomplished through the application of heating techniques within the low pressure chamber.
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