Australian Journal of Physics

Diffuse Reflection and Transmission by Uniform Noncoherently Scattering Media

RBT Black

Published Jun 1, 1967• 1 citation

Abstract

Diffusely reflected and transmitted spectral line profiles are calculated for uniform noncoherently scattering media onto which radiation of frequency near that of a resonance line of the medium is incident. Profiles are calculated for incident light that is either collimated or unifQrmly diffused and that is either monochromatic, or of uniform frequency distribution, or contains an absorption line centred on the resonance line under discussion. Spectral lines generated by uniformly excited media are also calculated.

DOI: 10.1071/ph670271

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Australian Journal of Physics

Diffuse Reflection and Transmission by Uniform Noncoherently Scattering Media

RBT Black

Published Jun 1, 1967• 1 citation

Publisher

Abstract

DOI: 10.1071/ph670271

Related papers

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Experimental line profiles and integrated intensities for backscattered and forward-scattered resonance radiation using white-light excitation are compared with theory for Na densities between

{10}^{19}

and

{10}^{22}

atoms/

{\mathrm{m}}^{3}

. Absorption measurements are used to verify linewidth and line-wing asymmetry parameters and Na-vapor densities. The scattered spectral intensities are normalized to the incident flux using calibrated diffusers. Measurements of scattered intensities were also made as

{\mathrm{N}}_{2}

was added to the Na. The line profiles and integrated intensities were calculated using a model which assumes complete redistribution of the radiation scattered by an atom and takes into account both radiative and nonradiative transport of the resonance excitation. The theory includes the effects of quenching by

{\mathrm{Na}}_{2}

and by admixed

{\mathrm{N}}_{2}

. With the white-light excitation used in these experiments the radiative transport is found to dominate the nonradiative transport except at wavelengths very near line center. The agreement between experimental and theoretical line profiles is good at high sodium densities (\ensuremath{\sim} 5 \ifmmode\times\else\texttimes\fi{}

{10}^{21}

atoms/

{\mathrm{m}}^{3}

) where instrumental resolution is not a serious limitation. The agreement between experimental and theoretical integrated intensities is within experimental error for Na densities of (1-10) \ifmmode\times\else\texttimes\fi{}

{10}^{19}

and (2-5) \ifmmode\times\else\texttimes\fi{}

{10}^{21}

atoms/

{\mathrm{m}}^{3}

. At the intermediate densities the approximately 20% discrepancy may be caused by the incomplete redistribution of radiation in the scattering process.