Open AccessAn improved quasistatic line-shape theory: The effects of molecular motion on the line wings
Author(s) -
Q. Ma,
R. H. Tipping
Publication year - 1994
Publication title -
the journal of chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.071
H-Index - 357
eISSN - 1089-7690
pISSN - 0021-9606
DOI - 10.1063/1.467124
Subject(s) - quasistatic process , line (geometry) , physics , wing , quasistatic approximation , spectral line , motion (physics) , absorption (acoustics) , computational physics , classical mechanics , optics , quantum mechanics , geometry , mathematics , thermodynamics
A theory is presented for the modification of the line‐shape functions and absorption coefficient due to the breakdown of the quasistatic approximation. This breakdown arises from the effects of molecular motion and increases the absorption in the near wings. Numerical calculations for the high‐frequency wing of the ν3 band of CO2 broadened by Ar are reported and it is shown that these effects are significant near the bandhead. The importance of such corrections in other spectral regions and for other systems is discussed briefly.
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