vactoair¶

pydl.goddard.astro.vactoair(vacuum)[source]¶

Convert vacuum wavelengths to wavelengths in air.

Parameters:

vacuum : array-like

Values of wavelength in vacuum in Angstroms.

Returns:

array-like

Values of wavelength in air in Angstroms.

Notes

Formula from P. E. Ciddor, Applied Optics, 35, 1566 (1996).
Values of wavelength below 2000 Å are not converted.