The infrared spectrum of propylene has been obtained under somewhat higher resolution than that used by previous workers. The improved resolution enables the assignment of many bands on the basis of the band types of the nearly symmetrical top. No important changes are made in existing assignments. The spectrum of propylene-d6 has been obtained. From an overtone band the unobserved torsional frequency is located at 174 cm−1 in propylene and at about 130 cm−1 in propylene-d6.
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b=broad; sh=sharp; s=strong; m=medium; w=weak; v=very. P, Q, and R refer to the branches of a single band. ? means an uncertain assignment or location of band peak. The numbers in column 4 refer to the fundamentals listed in Table III.
b=broad; sh=sharp; s=strong; m=medium; w=weak; v=very. P, Q, and R refer to the branches of a single band. ? means an uncertain assignment or location of band peak. The numbers in column 4 refer to the fundamentals listed in Table III.