CHEMILUMINESCENCE SPECTRA OF ScO AND YO: OBSERVATION OF THE $A'^{2}\Delta-X^{2}\Sigma^{+}$ BAND SYSTEMS
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Date
1976
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Ohio State University
Abstract
Beam-gas chemiluminescence spectra of ScO and YO resulting from the reactions of Sc and Y with $0_{2}$, under single-collision conditions, have been analyzed. In each case, in addition to the $A^{2}\Pi - X^{2}\Sigma^{+}$ band system, a new band system between 6200 and 7300 {\AA} has been observed. This previously unobserved band system in the ScO spectrum is quite weak, with few resolved band heads; however, the system is quite strong and well-developed in the case of YO. Vibrational analyses of the two distinct YO sub-systems, each consisting of double-headed bands, yields $T_{e} = 14 546.2 cm^{-1}$, $\omega_{e}^{\prime}= 795.72 cm^{-1} \omega_{e}x_{e}^{\prime} = 3.235 cm^{-1}$, $\omega_{e}"" = 865.13 cm^{-1}$, $\omega_{e}x_{e}^{\prime\prime} = 3.025 cm^{-1}$ for the lower component, and $T_{e} = 15 028.2 cm^{-1}$, $\omega_{e}^{\prime} = 792.48 cm^{-1}$, $\omega_{e}x_{e}^{\prime} = 2.77 cm^{-1}$, $\omega_{e}"" = 864.07 cm^{-1}$ ,$\omega_{e}x_{e}"" = 3.125 cm^{-1}$ for the upper component. Strong evidence supports the conclusion that the system is due to a transition from the low-lying $A^{\prime}^{2}\Delta$ state to the ground $X^{2}\Sigma^{+}$ state.
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$^{1}$ We have also used data of D. Cossart and M. Horani (unpublished) and of A. Lagerqvist, H. Westerlund, C, V. Wright, and R. F, Barrow, Arkiv. Fys, 14, 387 (1958).
Author Institution: Department of Chemistry, Massachusetts Institute of Technology
Author Institution: Department of Chemistry, Massachusetts Institute of Technology