A Modified Microwave-Induced Plasma (MIP) Discharge Chamber Exhibiting High Stability and Immunity from Sample Solvent Extinguishment.

摘要

A simple modification has been made to the discharge chamber of a microwave-induced plasma (MIP) at atmospheric pressure. The positioning of two carbon washers in approximately one-third of the region within which the MIP exists allows the formation of an auxiliary plasma which is unaffected by material entering the MIP. The auxiliary plasma provides thermal stabilization of the cavity when the primary MIP is adversely affected while solvent vapors pass through the chamber, reignites the MIP automatically, and increases MIP stability by keeping it centered in the chamber. The carbon washers do not significantly alter the spectral character of the MIP. (Author)