High intensity ion source

Details High intensity ion source High intensity ion source

H - Electricity

01

J

H01J 27/02 (2006.01) H01J 49/10 (2006.01)

Patent

CA 2305071

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 an 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 can be 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 aperture in the lens into a low pressure chamber without substantially desolvating. Substantial desolvation of the liquid charge stream can be later accomplished through the application of heating techniques within the low pressure chamber.

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