Refractive index database

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Optical constants of C2H2 (Acetylene)
Loria 1909: Gas at 0 °C; n 0.529–0.659 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]


Conditions & Spec sheet

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


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


S. Loria Über die Dispersion des Lichtes in gasförmigen Kohlenwasserstoffen. Annalen der Physik 334, 605-622 (1909) (in German).


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Acetylene, C2H2 (HCCH)

Acetylene (C2H2), often represented as HC≡CH, is a hydrocarbon and the simplest alkyne. It's a colorless gas under normal conditions and has a distinctive garlic-like odor. Acetylene is a key component for oxy-acetylene welding due to its ability to produce an extremely hot flame when combined with oxygen. This gas is also utilized in the production of various organic chemicals and the synthesis of polyethylene plastics and acrylics. Its linear structure confers a high degree of unsaturation, making it reactive in many chemical processes.

Other name

  • Ethyne

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