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• W2071832790 abstract "Abstract From an internally consistent many-body theory agreeing well with experimental wing-absorption, we have obtained an approximate, explicit expression for the complex refractive index of a thin atomic vapour, valid throughout resonance. According to this, the refractive index traverses a semicircle in the complex plane as the frequency passes through a resonance. The resulting symmetrical and unshifted absorption line has a half-elliptical central part and Lorentzian wings. The width and the maximum absorption are both proportional to the square root of the density. The results are obtained through a previously derived reformulation of the theory in terms of an effective polarizability of an atom in a many-body system. This shows how resonance broadening can be understood in macroscopic terms, as due to a feedback by an Onsager type reaction field. The limitations of this description are discussed in detail. It is concluded that a non-Lorentzian lineshape and a non-linear density dependence for the width are necessary consequences of any quasistatic many-body theory of absorption. Reanalysis of existing results of absorption experiments supports the theoretical width." @default.
• W2071832790 created "2016-06-24" @default.
• W2071832790 creator A5064531749 @default.
• W2071832790 date "1974-06-01" @default.
• W2071832790 modified "2023-09-25" @default.
• W2071832790 title "Quasistatic theory of optical absorption lines" @default.
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• W2071832790 doi "https://doi.org/10.1016/0022-4073(74)90047-8" @default.
• W2071832790 hasPublicationYear "1974" @default.
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