Refractive index database

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Optical constants of CH4 (Methane)
Martonchik and Orton 1994: Liquid at 111 K; n,k 0.002–71.4 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

temperature: 111 K


Phase I solid methane at 111 K (-162.15 °C, melting point)
CAUTION: don't rely on interpolated values: Most data points represent values at local maxima or minima


J. V. Martonchik and G. S. Orton. Optical constants of liquid and solid methane, Appl. Opt. 33, 8306-8317 (1994)


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Methane, CH4

Methane (CH4) is the simplest alkane and is a colorless, odorless gas under standard conditions. It is the primary constituent of natural gas and is notable for being a potent greenhouse gas. In the environment, methane is produced during the anaerobic decomposition of organic matter, such as in wetlands, ruminant digestion, and landfills. It can also be found in various industrial processes and is used as a fuel for heating and electricity generation. In the realm of optics, methane's refractive properties might be of interest, especially when considering its potential presence in gaseous atmospheres of extraterrestrial bodies.

Other name


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