Perpendicular Bands of Allene and Allene-d4

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Abstract
The distribution of intensity in the perpendicular bands of allene has been examined, taking into account the effect of the Coriolis interaction between the degenerate levels v9 and v10. The results indicate that in all the perpendicular bands of allene and allene-d4 the RQ0 branch lies on a line which divides the band into two equal (or very nearly equal) areas. This has been used as a criterion for a new rotational assignment of these bands and the rotational constants A and ζ have been re-evaluated. The present A values, together with Stoicheff's (reference 16) B values indicate that the CH bond length is 1.061 A and the HCH angle 116°.

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