Refractive index database

nk database   |   n2 database   |   about




Optical constants of Na (Sodium)
Althoff and Hertz 1967: n,k 2.25–10.2 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


R. Althoff and J. H. Hertz. Measurement of the optical constants of Na and K in the range of wavelength from 2.5 to 10 μ, Infrared Phys. 7, 11-16 (1967)


[CSV - comma separated]   [TXT - tab separated]   [Full database record]


Sodium, Na

Sodium (Na) is a soft, silvery-white, highly reactive alkali metal. Due to its high reactivity, it doesn't exist freely in nature and is usually found in the form of salts, like sodium chloride (NaCl or table salt). Sodium reacts vigorously with water, producing heat and forming sodium hydroxide and hydrogen gas. Optically, sodium's emission line in the yellow range (specifically around 589 nm) is well-known. This bright yellow "sodium line" emission is used in sodium vapor lamps, which are a type of gas discharge lamp. These lamps are used in street lighting and give off a characteristic yellow glow. The sodium doublet emission in the yellow range can also be used as a calibration source in spectroscopy.

External links