## Optical constants of NaI (Sodium iodide)

Li 1976: n 0.25–40 µm

Wavelength:
µm

(0.25–40)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=0.478+\frac{1.532λ^2}{λ^2-0.170^2}+\frac{4.27λ^2}{λ^2-86.21^2}$$### Conditions & Spec sheet

temperature: 297 K

### Comments

297 K (23.85 °C).

### References

H. H. Li. Refractive index of alkali halides and its wavelength and temperature derivatives. *J. Phys. Chem. Ref. Data* **5**, 329-528 (1976) and references therein.

^{*} Sellmeier formula derivation is based on a single data point and knowledge of the dielectric constants and the characteristic absorption peaks.