Monte Carlo simulation of radiation trapping and quenching of photofragment fluorescence after 193 nm photolysis of NaCl

Authors:
  • BCBruce L. Chadwick
    Bruce L. Chadwick
  • RMRichard J. S. Morrison
    Richard J. S. Morrison
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Abstract
The concentration of gas-phase NaCl is measured by monitoring Na photofragment fluorescence after 193 nm excimer laser photodissociation. Radiation trapping is observed for NaCl concentrations over 20 ppm resulting in a non-linear response of fluorescence with NaCl concentration. A Monte Carlo simulation of radiation trapping and quenching is performed to model the fluorescence response and to predict fluorescence intensities under the high-pressure conditions found in coal gasification.