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Refractive index database


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Optical constants of He (Helium)
Cuthbertson and Cuthbertson 1936: n 0.275-0.546 µm

Wavelength: µm
 (0.2753 – 0.5462)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula

$$n-1=\frac{0.014755297}{426.29740-λ^{-2}}$$

Conditions & Spec sheet

n_absolute: true
temperature: 0 °C
pressure: 101325 Pa

Comments

Standard conditions: 0 °C, 760 torr (101.325 kPa).

References

1) C. Cuthbertson and M. Cuthbertson. The refraction and dispersion of neon and helium. Proc. R. Soc. London A 135, 40-47 (1936)

2) C. Cuthbertson and M. Cuthbertson. On the refraction and dispersion of neon. Proc. R. Soc. London A 83, 149-151 (1910)

* Ref. 1 doesn't cite gas temperature and pressure. See the earlier publication by the same authors (ref. 2) instead.

Data

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

INFO

Helium, He

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