vactoair¶

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

Convert vacuum wavelengths to wavelengths in air.

Parameters

vacuumarray-like: Values of wavelength in vacuum in Angstroms. Quantity objects with valid length dimensions will be internally converted to Angstrom.

Returns

array-like: Values of wavelength in air in Angstroms. Quantity object was passed in, the output will be converted to the same units as the input.

Notes

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