Effect of multiple scattering on the intensity of depolarized light

✍ Scribed by J.J. Weis; B.J. Alder

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 178 KB
• Volume: 81
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(81)85338-9

✦ Synopsis

The effect of the higher-order scattering terms on the depolarized light intensity for the inert gases at liquid densities i.s shown to be negligrble by iterating the molecular dynamics calculation. The depolarized light scattering intensity calculated by the dipole-induced-dipole (DID) model, using an interaction-induced polarizability, approximated by its two-body term ("double scattering'), is higher than the experimental value for argon at the triple point [I]. The intensity was originally an order of magnitude larger than the measured value but recent experiments [2] suggest that deviations from the DID calculations are considerably less. In either case, Alder et al. [3] attributed this diiagreement to the neglect of 'SpolarizabiIity distortion" in the DID model [4] and showed that acceptable empirical forms for the pairwise polarizability distortion anisotropy could lower the scattering intensity by the required amount, whichever experiment turns out to be correct. Keyes and co-workers [S] , on the other hand, question the neglect of higher-order terms (beyond double scattering) in the multiple scattering series expansion for the intensity. Their argument relies on the fact that the double scattering term is exceeding-Iy small at liquid densities, due to a cancellation with-* Performed under the auspices of the US Department of Energy by the Lawrence Livermore NationaI Laboratory under contract number W-7405ENG-48.