Abstract
Spectral lines in discrete absorption or emission spectra are never strictly monochromatic. Even with the very high resolution of interferometers one observes a spectral distribution I(v) of the absorbed or emitted intensity around the central frequency v0 = (Ei - Ek)/h corresponding to a molecular transition with the energy difference ∆E = Ei - Ek between upper and lower level. The function I(v) in the vicinity of v0 is called the line profile (see Fig.3.1). The frequency interval δv = ∣v2 - v1∣ between the two frequencies vl and v2 for which I(v1) = I(v2) = I(v0)/2 is the full width at half maximum of the line (FWHM), often shortly called the linewidth or half— width of the spectral line.
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Demtröder, W. (1981). Widths and Profiles of Spectral Lines. In: Laser Spectroscopy. Springer Series in Chemical Physics, vol 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08257-7_3
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DOI: https://doi.org/10.1007/978-3-662-08257-7_3
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