| 摘要 |
<p>A plasma source for a spectrometer for spectrochemical analysis of a sample is characterized by use of the magnetic field component of applied microwave energy for exciting a plasma. The source includes a waveguide cavity (10) fed with TE10 mode microwave power. A plasma torch (16) passes through the cavity (10) and is axially aligned with a magnetic field maximum (18) of the applied microwave electromagnetic field. Magnetic field concentration structures such as triangular section metal bars (20) may be provided. In an alternative embodiment a resonant iris may be provided within a waveguide and the plasma torch positioned relative thereto such that the microwave electromagnetic field at the resonant iris excites the plasma.</p> |
