The liquid phase infrared and Raman spectra of α-pinene (2,6,6-trimethyl bicyclo[3.1.1] hept-2-ene) and β-pinene (6,6-dimethyl-2-methylene bicyclo [3.1.1] heptane) have been scanned between 100 and 4000 cm<sup>−1</sup> and the vapor phase infrared spectra of both compounds between 625 and 4000 cm<sup>−1</sup>. A number of the 72 allowed modes of the C<sub>10</sub>H<sub>16</sub> isomers can be assigned on the basis of group frequencies.

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