# THE a-X ELECTRONIC BAND SYSTEM OF SeO IN THE INFRARED REGION AT $1.8\;\mu$m

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 Title: THE a-X ELECTRONIC BAND SYSTEM OF SeO IN THE INFRARED REGION AT $1.8\;\mu$m Creators: Reddy, S. Paddi; Verma, K. K. Issue Date: 1978 Publisher: Ohio State University Abstract: The emission spectrum of the SeO molecule excited in a discharge tube by a microwave generator and recorded at low resolution with an infrared spectrometer equipped with a lead sulphide detector revealed the existence of a brief band system in the region $6470 - 5540\;cm^{-1}$. The system consists of $\Delta v = 0$ and +1 sequences and is assigned to the transition $a2 - X_{2}1$ (X being the case - c $^{3}\Sigma^{-}$ ground state of the SeO molecule). The transition $a2 - X_{1} 0$ is forbidden because of the selection rule $\Delta \Omega=0, \pm 1$. An approximate value of the rotational constant $B_{o}$ of state a is obtained from the observed separation between the Q and R heads of the 0-0 band and the known value of $B_{o}$ of state $^{X} 1$ The derived molecular parameters of state a are: $v_{00}=5566.7\;cm^{-1}$, $\Delta G(\frac{1}{2}) = 883.3\;cm^{-1} B_{0} = 0.45_{6}\;cm^{-1}$. The value of $B_{o}$ of a is in reasonable agreement with one obtained form a previous study of the gas phase electron spin resonance spectrum of $SeO^{2}$ Molecular constants of all the known electronic states of SeO will also b discussed. Description: $^{1}$K. K. Verma and S. P. Reddy, J. Mol. Spectrosc. 67, 360 (1977). $^{2}$A. Carrington, G. N. Currie, D. H. Levy, and T. A. Miller, Mol. Physics 17, 535 (1969). S. P. Reddy is on sabbatical leave from the Department of Physics, Memorial University of Newfoundland, St. John's Newfoundland, Canada, AIB 3X7."" Author Institution: Department of physics, The Ohio state university; Department of Chemistry, University of Iowa URI: http://hdl.handle.net/1811/10467 Other Identifiers: 1978-RB-04