Patent ID: 8704171

Claim:
A method comprising: introducing a non-ionized sample gas; supplying a reagent vapor to a plasma chamber; generating one or more reagent ions from the reagent vapor supply in the plasma chamber by transferring microwave or high-frequency RF energy from a cavity to the plasma chamber to form one or more reagent ions; directing the one or more reagent ions to a drift chamber; reducing an amount of microwave or high-frequency RF energy extending into the drift chamber from the plasma chamber; interacting the one or more reagent ions with the non-ionized sample gas to form one or more product ions; directing the one or more product ions and the one or more reagent ions to a quadrupole or time-of-flight mass spectrometer module; and determining by the mass spectrometer module a value for at least one of a peak intensity or mass of each of the one or more product ions and the one or more reagent ions.