Patent ID: 9406491
Filing Date: 2016-08-02
CPC Classification: H01J

Claim Text:
1. A mass spectrometer, comprising: an atmospheric-pressure chemical ionization (APCI) source; one or more low-pressure chemical ionization (LPCI) sources; a photoionization lamp configured to ionize a target substance in a low pressure gas as the low pressure gas exits a capillary and expands into a subsequent vacuum environment; a mass analyzer configured to separate ions of a sample flow from the APCI source and the one or more LPCI sources; a detector configured to identify and quantify the received separated ions; and a plurality of valves configured to open and close associated input lines to the APCI source and the one or more LPCI sources, via a controller, and configured to maintain the vacuum environment of the mass spectrometer during the opening and closing.