## Abstract

The study of the absorption spectrum previously reported has been extended to include the 1900- to 2200- and the 4400- to 6750-cm^{−1} regions. Rotational analysis provides 20 states from which the following constants are determined: *α*_{1} = 6.8_{2}, *α*_{2} = 6.3_{0}, *α*_{3} = 5.6_{0}, *α*_{4} = −1.3_{0}, *α*_{5} = −2.2_{0} × 10^{−3} cm^{−1} and *B** _{e}* = 1.1824

_{0}cm

^{−1}. This value was used with

*B*

*values for C*

_{e}_{2}HD and C

_{2}D

_{2}to determine the bond length of ${\mathcal{r}}_{e}\left(\mathrm{C}-\mathrm{H}\right)={1.060}_{3}$ and ${\mathcal{r}}_{e}\left(\mathrm{C}\equiv \mathrm{C}\right)={1.203}_{4}\phantom{\rule{0.2em}{0ex}}\AA $.

A total of 46 states was available, from this and other work, to determine a set of vibrational constants. About one-half of the 23 constants have been determined with acceptable precision. The remaining constants are still in doubt due, primarily, to resonances.

© 1963 Optical Society of America

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