Refractive index database

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Optical constants of NH3 (Ammonia)
Cuthbertson and Cuthbertson 1914: n 0.480–0.671 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula



0 °C, 760 mm Hg.


C. Cuthbertson and M. Cuthbertson. On the refraction and dispersion of the halogens, halogen acids, ozone, steam, oxides of nitrogen and ammonia, Phil. Trans. R. Soc. Lond. A 213, 1-26 (1914)


[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]


Ammonia, NH3

Ammonia (NH3) is a compound of nitrogen and hydrogen, manifesting as a colorless gas with a distinct pungent smell. In the realm of optics, ammonia is notable not only for its refractive index and absorption characteristics, especially in the infrared region where it exhibits absorption bands, but also as a lasing medium. Ammonia gas has been used in far-infrared NH3 lasers, which operate based on the molecule's inversion transitions. Industrially, ammonia plays a pivotal role in fertilizer production and also serves as a refrigerant. Its liquid form can dissolve a variety of inorganic salts, acting as a solvent. However, given its corrosive nature and potential to form explosive mixtures with air, it's imperative to handle and store ammonia with caution.

Other names

  • Azane
  • Hydrogen nitride
  • Trihydrogen nitride
  • Nitro-sil

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