A Detailed Consideration of Resonance Radiation Trapping in the Argon Inductively Coupled Plasma.
Interim technical rept.,
INDIANA UNIV AT BLOOMINGTON DEPT OF CHEMISTRY
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The extent and duration of trapping of argon resonance radiation 106.7 nm and 104.8 nm in the ICP was calculated using a model incorporating line shape contributions from both Doppler and pressure broadening. The trap was found to be at the pressure-broadened limit, giving an escape factor of 7.9 x 10 to the minus 4th power when excitation of the 4s states in the plasma annulus is assumed. Theoretical apparent radiative lifetimes Tau for argon 3 p 1 and 1 p 1 resonance states are calculated to be 8 microseconds and 1.9 microsecond respectively. The quartet of 4s states, rapidly mixed by electron collisions, are presumed to share an overall apparent radiative lifetime tau app 1.6 microseconds for the purpose of plasma modeling. Effects of this radiation trapping on the argon 4s atom density and on electron-ion recombination are discussed.
- Atomic and Molecular Physics and Spectroscopy