Ionizer and mass spectrometer including first section for ionizing sample under atmospheric pressure while vaporizing or desorbing the sample component and second section for generating corona discharge
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United States of America Patent
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Jun 27, 2017
Grant Date -
Jun 9, 2016
app pub date -
Aug 2, 2013
filing date -
Aug 2, 2013
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Abstract
In the ionizer of the present invention, a stream of gas spouted from a nozzle (18) of a DART ionization unit (10) vaporizes and ionizes the components in a sample (25). Gaseous sample-component molecules which have not been ionized by that process are subsequently ionized by a reaction with a reactant ion produced by a corona discharge generated from a needle electrode (20). Such a two-stage ionization of the sample-component molecules improves the ionization efficiency. A needle-electrode support mechanism (21) adjusts the position and/or angle of the needle electrode (20) and thereby controls a potential gradient. Therefore, a specific sample-derived ion species can be efficiently introduced into an ion introduction tube (31) and be detected with a high level of sensitivity.
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