Refractive index of CH4 (Methane) - Martonchik-liquid-111K

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

Wavelength: µm

(0.0020–71.43)

Complex refractive index (n+ik)[ i ]

Derived optical constants

Conditions & Spec sheet

temperature: 111 K

Comments

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

References

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

Data

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

Optical transmission calculator

Wavelength: µm
Thickness:
Calculation method:

Transmittance[ i ]

T =

LogX LogY eV

Reflection calculator

Wavelength: µm
Angle of incidence (0~90°):
Direction: in out

Reflectance[ i ]

P-polarized

R_P =

S-polarized

R_S =

Non-polarized (Rp+Rs)/2

R =

R_P R_S R LogY

Reflection phase[ i ]

ɸ_P = °
ɸ_S = °

Brewster's angle[ i ]

θ_B = °

Critical angle[ i ] [ i ]

θ_C = °

INFO

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

Tetrahydridocarbon

RefractiveIndex.INFO

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

Complex refractive index (n+ik)[ i ]

Refractive index[ i ]

Extinction coefficient[ i ]

Derived optical constants

Relative permittivity (dielectric constants)[ i ] [ i ]

Absorption coefficient[ i ] [ i ]

Abbe number[ i ]

Chromatic dispersion[ i ]

Group index[ i ] [ i ]

Group velocity dispersion[ i ] [ i ] [ i ]

Conditions & Spec sheet

Comments

References

Data

Optical transmission calculator

Transmittance[ i ]

Reflection calculator

Reflectance[ i ]

P-polarized

S-polarized

Non-polarized (Rp+Rs)/2

Reflection phase[ i ]

Brewster's angle[ i ]

Critical angle[ i ] [ i ]

INFO

Methane, CH₄

Other name

External links

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

Complex refractive index (n+ik)[ i ]

Refractive index[ i ]

Extinction coefficient[ i ]

Derived optical constants

Relative permittivity (dielectric constants)[ i ] [ i ]

Absorption coefficient[ i ] [ i ]

Abbe number[ i ]

Chromatic dispersion[ i ]

Group index[ i ] [ i ]

Group velocity dispersion[ i ] [ i ] [ i ]

Conditions & Spec sheet

Comments

References

Data

Optical transmission calculator

Transmittance[ i ]

Reflection calculator

Reflectance[ i ]

P-polarized

S-polarized

Non-polarized (Rp+Rs)/2

Reflection phase[ i ]

Brewster's angle[ i ]

Critical angle[ i ] [ i ]

INFO

Methane, CH4

Other name

External links

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

Methane, CH₄