Not to be confused with the Born–Oppenheimer approximation.
Generally in scattering theory and in particular in quantum mechanics, the Born approximation consists of taking the incident field in place of the total field as the driving field at each point in the scatterer. The Born approximation is named after Max Born who proposed this approximation in early days of quantum theory development.[1]
It is the perturbation method applied to scattering by an extended body. It is accurate if the scattered field is small compared to the incident field on the scatterer.
For example, the scattering of radio waves by a light styrofoam column can be approximated by assuming that each part of the plastic is polarized by the same electric field that would be present at that point without the column, and then calculating the scattering as a radiation integral over that polarization distribution.
^Born, Max (1926). "Quantenmechanik der Stossvorgänge". Zeitschrift für Physik. 38 (11–12): 803–827. Bibcode:1926ZPhy...38..803B. doi:10.1007/BF01397184. S2CID 126244962.
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