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 c4h8
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

List of available data for all molecules in database
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