Knowledge Bank

Recently Rao and $Palik1$ have resolved the $\nu 11$(E) of allene at 28 $\mu$ and found that the average separation of the Q branches of this band which represents essentially $2[Av\prime (1-\zeta v)-Bv\prime ]v-11$ is 1.2 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$. Using this result, a re-evaluation has been made of the $\zeta$-factors and the constant A for allene. The following values have been obtained: {A} = 5.07 {cm}^{-1};\qquad \zeta_{8} = 0.05;\qquad \zeta_{11} = 0.82\mbox{ and } \zeta_{9} + \zeta_{10} = 0.16 A discussion will be given of some recently obtained high resolution spectra of the various perpendicular bands of allene.