Accession Number:

AD0631796

Title:

AN INVESTIGATION OF THE EFFECT OF MULTIPLE ABSORPTION AND EMISSION OF RESONANCE-LINE PHOTONS ON LINE SHAPE AND LINE INTENSITY,

Descriptive Note:

Corporate Author:

TENNESSEE UNIV KNOXVILLE DEPT OF PHYSICS

Report Date:

1966-02-01

Pagination or Media Count:

137.0

Abstract:

The purpose of the study was to investigate the effect of multiple absorption and emission of resonance-line photons on pressure-broadened line shapes and intensities and to determine if this effect could explain the experimentally observed deviations from Lorentz theory. A Monte-Carlo method was used to follow photons step by step through an absorption cell. The effect of multiple scattering on line intensities was determined over a wide range of cell geometries and maximum absorption coefficients and was found to be over 10 for the usual experimental conditions. Line Shapes were calculated for several HF rotation-vibration lines, with the actual parameter values and cell geometries used in an experimental study. Comparison with the observed line shapes indicates that multiple scattering certainly accounts for some of the observed deviations from Lorentz shape. Also, it was found that experimentally determined half-widths and maximum absorption coefficients can be seriously in error. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE