How to avoid corona discharge in the IM Drift Cell and electrospray when increasing the voltage in the macroIMS system?
IM Drift Cell: A clean IM Drift Cell running in air will not exhibit breakdown over its operating range up to 10 kV. If it has been severely contaminated, it sometimes breaks down over internal insulator surfaces at values slightly below 10 kV: it is then time to clean the unit following procedures given in the manual. Electrospray: An electrospray will not operate in the cone-jet mode when a corona discharge is present. But to electrospray aqueous solutions requires fields near the 30 kV/cm breakdown value of air. In the 3480C, this potential problem is solved by providing a small admixture (~10%) of CO2 in the air stream. This suppresses the corona discharge.
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