Accession Number : ADA136633

Title :   A Detailed Consideration of Resonance Radiation Trapping in the Argon Inductively Coupled Plasma.

Descriptive Note : Interim technical rept.,


Personal Author(s) : Mills,J W ; Hieftje,G M

PDF Url : ADA136633

Report Date : 12 Dec 1983

Pagination or Media Count : 28

Abstract : 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.

Descriptors :   *Argon, *Plasmas(Physics), *Trapping(Charged particles), Excitation, Atomic orbitals, Resonance radiation, Inductance, Coupling(Interaction), Chemical analysis

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE