## Optical constants of Air

Ciddor 1996: n 0.23–1.690 µm

Wavelength:
µm

(0.23–1.69)

### Complex refractive index (*n+ik)*

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n-1=\frac{0.05792105}{238.0185-λ^{-2}}+\frac{0.00167917}{57.362-λ^{-2}}$$### Conditions & Spec sheet

n_is_absolute: true wavelength_is_vacuum: true temperature: 15 °C pressure: 101325 Pa

### Comments

Standard air: dry air at 15 °C, 101.325 kPa and with 450 ppm CO_{2} content.

### References

P. E. Ciddor. Refractive index of air: new equations for the visible and near infrared, *Appl. Optics* **35**, 1566-1573 (1996)

[Calculation script (Python) - can be used to calculate the refractive index of air for specific values of humidity, temperature, pressure, and CO_{2} concentration]