Electronic emission spectra of diatomic free radicals SeO and SbO

Verma, Kumar Krishna (1977) Electronic emission spectra of diatomic free radicals SeO and SbO. Doctoral (PhD) thesis, Memorial University of Newfoundland.

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Abstract

Experimental studies of several electronic transitions of the SeO free radical in the spectral region 2000 - 18 OOO A and of one electronic transition of the SbO free radical in the region 3240 - 4720 A have been made. -- The 0 - 0 bands at 10 296 and 10 491 A of the near-infrared band system b - X of SeO have been photographed at high resolution and their rotational structures have been analyzed. The analysis shows that the bands represent the transition b0⁺ - XO⁺,1 (X being the case (c) ³E- ground state of SeO. Rotational constants of substates X₁0⁺, X₂1⁻ and X₂1⁺ of the ground state and that of state b0⁺ have been derived. The observed isotope shifts of the rotational lines of ⁷⁸SeO from those of ⁸⁰SeO are in good agreement with the calculated values. Franck-Condon factors and r-centroids are reported for the b - X system. -- Three electronic band systems of SeO in the spectral regions, around 18 000 A, 6730 - 8570 A and 2690 – 3190 A have been observed for the first time at medium resolution. Vibrational constants for the upper and lower states of these transitions, whenever possible, have been derived. Vibrational analyses of these systems suggest that these arise from the transitions a2 - X₂1; A0,1,2 - X0⁺ ,1 and C2,1,0 – X0⁺ ,1, respectively. Approximate rotational constant B₀ for state a or A is estimated from the separations of the observed R and O heads or P and O heads. The vibrational structure of two known brief band systems of SeO in the region 2070 - 2270 A have been reanalyzed and the molecular constants derived. From the analysis, the transitions are labelled F – a¹ ∆ (2150 - 2270 A) and G – a¹∆ (2070 - 2130 A). Klein-Dunham potential energy curves are constructed for the X₁d0⁺, b0⁺, A₁0 states as well as the previously known B₁0⁺ state of SeO. -- The 0 – 0 and 1 - 0 bands of the B²∑⁺ - X²π₃/₂ subsystem of SbO have been photographed under high resolution and the rotational constants derived.

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