# COLOR CENTER LASER SPECTROSCOPY OF $C_{2}D$ AND $C_{3}H$

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 Title: COLOR CENTER LASER SPECTROSCOPY OF $C_{2}D$ AND $C_{3}H$ Creators: Yan, W.- B.; Dane, C. B.; Hall, Jeffrey L.; Curl, R. F., Jr. Issue Date: 1986 Publisher: Ohio State University Abstract: The infrared spectrum of a discharge in argon over d-polyacetylene has been obtained using a color center laser spectrometer and magnetic rotation detection. Many lines $(\sim 3-5 per cm^{-1})$ are observed, some of which can be identified as Ar atom transitions or as lines of the Ballik-Ramsay bands of $C_{3}$. In particular, two bands of the $A^{2}\Pi \leftarrow X^{2}\Sigma^{+}$ electronic transition of $C_{2}D$ have been identified, assigned, and analyzed. One near $3730 cm^{-1}$ is a hot band of the bending mode of vibronic symmetry type $^{2}\Sigma^{-} \leftarrow ^{2}\Pi$. The other near $3850 cm^{-1}$ is of $^{2}\Pi \leftarrow ^{2}\Sigma^{+}$ symmetry involving the ground vibronic state of the molecule. Five bands of $C_{2}H$ had been previously observed1 in this system by these methods and $analyzed^{2}$. Four are of the type, $^{2}\Pi \leftarrow ^{2}\Pi^{+}$ with the lower state the ground vibronic state of the molecule, and the fifth is a hot band of vibronic symmetry $^{2}\Sigma^{-} \leftarrow ^{2}\Sigma^{+}$. A new band near $3600 cm^{-1}$ in $C_{2}H$ has been assigned and analyzed. It is a $^{2}\Pi \leftarrow ^{2}\Sigma^{+}$ band involving the ground vibronic state (like four of the five older bands). Vibronic assignments for all the bands ($C^{2}H$ and $C^{2}D$) will be proposed and the implications for the vibrational frequencies of $C_{2}H$ will be discussed. Description: $^{1}$P. G. Carrick, A. J. Merer, and R. F. Curl, J. Chem. Phys. 78, 3652 (1983). $^{2}$R. F. Curl, P. G. Carrick, and A. J. Merer, J. Chem. Phys. 82. 3479 (1985). Address: Chemistry Department and Rice Quantum Institute, Rice University, Houston, Texas 77251, USA. Author Institution: URI: http://hdl.handle.net/1811/16944 Other Identifiers: 1986-MG'-5