In database:

600-9890 cm-1

137-201 nm

Acetylene (C₂H₂)
Molecular weight 26 amu
Freezing point -81.8 C
Boiling point 84 C
HITRAN number: 26

Infrared cross-sections from PNNL
FTIR infrared cross-sections from 600 to 6650 cm^-1
Data available at 5 C, 25 C, and 50 C
Spectra is composite of on the order of 10 different pressures,backfilled with nitrogen to 760 T.
Images of PNNL data in cm²/molecule vs. wavenumbers
Images of PNNL data in cm²/molecule vs. microns


Line list from HITRAN 2008
Data from 604 to 9890 cm^-1
Images of HITRAN data on a log scale

Line list from HITRAN 2004
Data from 604 to 6685 cm^-1.
Images of HITRAN 2004 data in cm/molecule vs. wavenumbers
Images of HITRAN 2004 data in cm/molecule vs. microns

Line list from HITRAN 2000
Data from 604 to 3374 cm^-1.
Images of HITRAN 2000 data in cm/molecule vs. wavenumbers

UV cross-sections
From Harvard-Smithsonian Center for Astrophysics
Image of data from 137 to 201 nm

Additional References
Line Intensities of Acetylene at 3 mm; J.-Y. Mandin, D. Jacquemart, V. Dana, L. Regalia-Jarlot, and A. Barbe; JQSRT 92:239-260 (2005).
Images of data compared with HITRAN 2004 from 3186 to 3376 cm^-1

New S₁ State Vibrational and T_3,2,1 Spin-Rotational Assignments in the Vicinity of the Acetylene A¹A_u-X¹S_g⁺ V₀³K₀¹ Band; A.P. Mishra, R.L. Thom, and R.W. Field; J.Mol.Spec. 228:565-579 (2004).
Figure 1, image of the data between 45290 and 45315 cm^-1.

The Overtone Spectrum of C₂D₂ and C₂H₂ by ICLAS-VECSEL near 1 mm; A. Campargue, E. Bertseva, and Y. Ding; J.Mol.Spec. 220:13-18 (2003).
Figures 1 and 2, image of the data between 9880 and 9950 cm^-1.

Vibrational Spectroscopic Database on Acetylene, X¹S_g ⁺(¹²C₂H₂, ¹²C₂D₂, and ¹³C₂H₂); M.Herman, A. Campargue, M.I. El Idrissi, and J. Vander Auwera; Journal of Physical and Chemical Reference Data, 32:921-1361 (2003).
Figure 1, image of the fundamental vibrations.

Absolute Line Intensities in Acetylene: The 1.5-mm Region; R.El Hachtouki and J.V. Auwera; J.Mol.Spec. 216:355-362 (2002).
Figure 1, image of data between 6450 and 6670 cm^-1

ICLAS of ¹²C₂H₂ between 10140 and 10600 cm^-1; Y. Ding, M. Herman, and A. Campargue; J.Mol.Spec. 212:125-129 (2002).
Figure 1, image of data between 10408 and 10417

Calculated Vibrational Intensities in the A-X Electronic Transition of Acetylene; J.K.G. Watson; J.Mol.Spec. 207:276-284 (2001).
Figures 1 and 2, image of the spectra between 5000 and 15000 cm^-1.

Notes
Fundamental frequencies from NIST Chemistry Webbook
n₁ 3374 cm^-1 (S_g⁺) CH stretch
n₂ 1974 cm^-1 (S_g⁺) CC stretch
n₃ 3289 cm^-1 (S_u⁺) CH stretch
n₄ 612 cm^-1 (p_g) CH bend
n₅ 730 cm^-1 (p_u) CH bend



List of available data for all molecules in database
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