https://doi.org/10.1351/goldbook.08291
Graph of a quantity derived from the radiant power at each wavelength (frequency or wavenumber) as ordinate plotted against the wavelength (frequency or wavenumber) of electromagnetic radiation as abscissa.
Notes:
- In mid-infrared and Raman spectroscopy, wavenumber is mostly used today, while it is more commonly replaced by wavelength in near infrared spectroscopy.
- Quantities plotted include absorbance, absorption coefficient, transmittance, reflectance, luminescence.