Accession Number:

ADA136633

Title:

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

Descriptive Note:

Interim technical rept.,

Corporate Author:

INDIANA UNIV AT BLOOMINGTON DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1983-12-12

Pagination or Media Count:

28.0

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.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE