In database:

600-6500 cm-1

Isobutene ((CH₃)₂CCH₂)
Molecular weight 56.107 amu
Freezing point -139 C
Boiling point 6.9 C

Infrared cross-sections from PNNL
FTIR infrared cross-sections from 600 to 6500 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 wavenumbers
Images of PNNL data in microns

Additional References
Intramolecular Vibrational Dynamics of the Asymmetric =CH₂ Hydride Stretch of Isobutene; D.A. McWhorter and B.H. Pate; J.Mol.Spec. 193:159-165 (1999)

The Torsional Spectra of the Isomeric Butenes. An Ab Initio Study of the Far Infrared and Raman Spectra of Trans-2-butene, cis-2-butene, and 2-methylpropene (Isobutene); M.L. Senent, D.C. Moule, and Y.G. Smeyers; J.Mol.Spec. 372:257-266 (1995).

Notes
Fundamental frequencies from NIST Chemistry Webbook
n₁ 2989 cm^-1 (a₁) CH₂ stretch
n₂ 2941 cm^-1 (a₁) CH₃ stretch
n₃ 2911 cm^-1 (a₁) CH₃ stretch
n₄ 1661 cm^-1 (a₁) CC stretch
n₅ 1470 cm^-1 (a₁) CH₃ deform
n₆ 1416 cm^-1 (a₁) CH₂ scis
n₇ 1366 cm^-1 (a₁) CH₃ deform
n₈ 1064 cm^-1 (a₁) CH₃ rock
n₉ 801 cm^-1 (a₁) CC stretch
n₁₀ 383 cm^-1 (a₁) CCC₂ in plane deform
n₁₁ 2970 cm^-1 (a₂) CH₃ stretch
n₁₂ 1459 cm^-1 (a₂) CH₃ deform
n₁₃ 1076 cm^-1 (a₂) CH₃ rock
n₁₄ 981 cm^-1 (a₂) CH₂ twist
n₁₅ 193 cm^-1 (a₂) CH₃ torsion
n₁₆ 3086 cm^-1 (b₁) CH₂ stretch
n₁₇ 2980 cm^-1 (b₁) CH₃ stretch
n₁₈ 2893 cm^-1 (b₁) CH₃ stretch
n₁₉ 1458 cm^-1 (b₁) CH₃ deform
n₂₀ 1381 cm^-1 (b₁) CH₃ deform
n₂₁ 1282 cm^-1 (b₁) CC stretch
n₂₂ 1043 cm^-1 (b₁) CH₃ rock
n₂₃ 974 cm^-1 (b₁) CH₂ rock
n₂₄ 430 cm^-1 (b₁) CCC₂ in plane deform
n₂₅ 2945 cm^-1 (b₂) CH₃ stretch
n₂₆ 1444 cm^-1 (b₂) CH₃ deform
n₂₇ 1079 cm^-1 (b₂) CH₃ rock
n₂₈ 890 cm^-1 (b₂) CH₂ wag
n₂₉ 429 cm^-1 (b₂) CCC₂ out of plane deform
n₃₀ 196 cm^-1 (b₂) CH₃ torsion



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