Napierian spectral absorption coefficient (of a homogeneous non-diffusing layer) [an(λ)]

quotient of the natural (Napierian) logarithm of the reciprocal of the spectral internal transmittance, τi(λ), of a layer of the medium by the length, l, of the path of a beam of radiation traversing that layer


Unit: m-1

See "Napierian spectral absorbance" for the definition of An(λ)

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