## conversion spectrum

https://doi.org/10.1351/goldbook.C01319
A plot of a quantity related to the absorption (@[email protected], cross section, etc.) multiplied by the @[email protected] for the considered process against a suitable measure of photon energy, such as frequency, $$\nu$$, wavenumber, $$\sigma$$, or @[email protected], $$\lambda$$, e.g. the conversion cross section, $$\sigma \varphi$$, has the SI unit $$\mathrm{m}^{2}$$.