Windowless atmospheric pressure vacuum UV spark discharge source for e.g. atmospheric pressure photo ionization mass spectrometry, has inlet and outlet provided from anode to cathode, and edges with minimum distance relative to each other

摘要

The source has an anode (10) and a cathode (20) performing a discharging process. A discharge gas inlet (12) and a discharge gas outlet (15) are provided from the anode to the cathode. Discharge edges have a minimum required distance relative to each other. An ionization unit includes a ceramic or cement casing (2), a coaxial high voltage cable (3) and a discharge chamber (4) engaged in an ion transfer capillary (6). A physical separation between the chamber and a capillary gas flow (1) is carried out by adjusting a pressure in the chamber to a static pressure of the flow.