barak.spec.vac2air_morton¶

barak.spec.vac2air_morton(vacw)[source]¶

Convert vacuum wavelengths in Angstroms to air wavelengths.

This uses the relation from Morton 1991, ApJS, 77, 119. Only valid for wavelengths > 2000 Ang. Use this for compatibility with older spectra that may have been corrected using the (older) Morton relation. The Ciddor relation used in vac2air_ciddor() is claimed to be more accurate at IR wavelengths.