A THEORY OF SPECTRAL LINE SHAPE FOR ATMOSPHERIC ABSORPTION: PART III: THE FANO COLLISION OPERATOR FROM NEAR TO FAR WING

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Authors
  1. Roney, P.L.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
In this third part of A Theory of Spectral Line Shape for Atmospheric Absorption, an evaluation of the frequency dependence of the complete Fano collision operator has been made using the collision time theory developed earlier. This results in a considerable reduction of the terms in the Fano operator. An analysis of the spectral line wing shows that there are two different regimes: the near wing and the far wing. These regimes are demarcated by a turning point at a frequency displacement of kT/h. In the very far wing, beyond the turning point, the behaviour of the Fano operator changes and the effects of binary collision overlap and photon absorption into the binary collision complex become important. The line wing behaviour is corroborated qualitatively by experimental results for carbon dioxide near 4.2 mu m.
Keywords
Line coupling;LOWTRAN;FASCOD2;Collision time theory;Line shifts;Fano relaxation matrix;Fano operators;Far wings;Modelling;Non-Lornetzian line wings;Line shapes;CO2 continuum
Report Number
DREV-9409 — Technical Report; See also Part I-III (DSIS 93-00068, 94-04006)
Date of publication
01 Mar 1995
Number of Pages
47
DSTKIM No
95-02823
CANDIS No
150960
Format(s):
Document Image stored on Optical Disk;Hardcopy

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