Monte Carlo treatment of resonance-radiation imprisonment in fluorescent lamps

Abstract

The imprisonment of the 2537-A resonance radiation from mercury in the mercury-argon discharge of fluorescent lamps is treated by a Monte Carlo method. The effects of emission and absorption linewidths, hyperfine splitting, isotopic composition, collisional transfers of excitation, and quenching are explicitly incorporated in the calculations. The calculated spectra of emitted radiation are in good agreement with measured spectra for several combinations of lamp temperature and mercury composition. Also in agreement with experiments, the addition of '80Hg to natural mercury is found to increase lamp efficiency. The method is useful for a number of problems in radiation transfer.

Detailed balance in hyperfine structure with radiation trapping

“…As we know, currently, trapping problems are calculated either by the Monte Carlo simulation [6,9,11] or by the numerical quadrature methods [12,17]. Almost all of the quadrature methods used to treat trapping problems are based on the numerical interpolation of the excited particle density.…”

“…In practice, the hyperfine structure is rather common in atomic spectroscopy. As far as we know, radiation trapping in such system is usually treated either with overall Monte-Carlo simulation [6] or as a single resonance line under the assumption that the detailed balance is maintained among the lines [7,8]. Here the detailed balance among hyperfine structure means that the population of each excited state is locally in thermodynamic equilibrium.…”

Three-dimensional fluid simulation of a plasma display panel cell

“…However, the resonant UV photons emitted from Xe*( 3 P 1 ) suffer many absorptions and reemissions before they reach the wall. The strict kinetics of the resonant photons is described by solving the Holstein equation 15 or using a multiple-scattering representation, 16,17 which is very time consuming. Therefore, the concept of an escape factor is often used for an approximate formulation of incorporating trapping effects, especially in PDP simulation.…”

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

“…In addition, the competition between photon emission and collisional quenching has to be considered. The trapping effect can be corrected with the aid of MonteeCarlo modelling [364,365]. The simulation tracks the excitation energy of the excited species as it is transferred by successive emission events and calculates the net probability of photons escaping from the measurement volume, where it may then be detected.…”