Atmospheric pressure ionization mass spectrometer
AssigneeHitachi, Ltd.
InventorsYasuhiro Mitsui, Osami Okada
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Abstract
An atmospheric pressure ionization mass spectrometer which comprises an ion source for ionizing a sample gas, a low pressure region provided with a mass filter and a collector therein, a differential pumping region provided between the ion source and the low pressure region and with electrodes provided on the side of the ion source and on the side of the low pressure region, respectively, and a pressure-gradient electrode means for dissociation and removal of cluster ions, as connected to the electrode on the side of the ion source among the electrodes provided in the differential pumping region is disclosed.
Claims4
An atmospheric pressure ionization mass spectrometer comprising:
- an ion source for ionizing a sample gas;
- a low pressure region provided with a mass filter and a collector therein;
- a differential pumping region provided between said ion source and said low pressure region;
- first and second electrodes provided on one side of said ion source and on one side of said low pressure region, respectively;
- and
- a pressure-gradient electrode means for providing an ..increasing.!. increased pressure having a gradient from said first electrode toward said second electrode for dissociation and removal of cluster ions, said pressure-gradient electrode means being connected to said first electrode and being provided in said differential pumping region.
Dependencies are inferred from the claim text.