| 摘要 |
<p>A microwave resonant cavity (10) for a spectroscopic light source includes a housing (12) having therein a chamber (26) formed by side walls (14, 16) and a cylindrical outer wall (18). The side walls have aligned openings (22, 24) therethrough which are on the longitudinal axis of the outer wall (18). A refractory tube (34) which is adapted to contain a gaseous plasma extends through the aligned openings (22, 24) and across the chamber (26) in the housing. A coupling loop is electrically coupled to a side wall (16) of the chamber (26) within a portion (32) of the chamber (26) and is connected to a coaxial connector (67, 70) which extends through the outer wall (18) of the housing (12) to deliver microwave power to the chamber (26). One end of the refractory tube (34) extends into an exhaust chamber (48) mounted at one side wall (16) of the housing. The exhaust chamber (48) has an exhaust passage (52, 54) to permit exhausting of gas. Means (57 - 61) extend into the exhaust chamber (48) for extracting a portion of the gaseous plasma effluent from the end of the refractory tube (34) into a mass spectrometer.</p> |
