Molar Napierian @A00037@ divided by the @A00543@. When integrated against the logarithm of wavenumber (or frequency) it is called the integrated absorption cross-section.
Green Book, 2nd ed., p. 32 [Terms
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)
) on page 2169 [Terms
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)
) on page 2226 [Terms