ROTATIONAL ANALYSIS OF THE $B {^{2}\Sigma^{+}} \rightarrow X {^{2}\Sigma^{+}}$ SYSTEM OF ALO

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1983

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Ohio State University

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The $B^{2}\sum^{+} \rightarrow X^{2}\sum^{+}$ ``blue-green"" band system of A10 was excited in a microwave discharge through a flow of aluminum chloride and trace quantities of oxygen. Twenty-five bands with $0 \leq \nu^{1} \leq 9$ and $0 \leq \nu^{1} \leq 7$ have been photographed at high resolution and rotationally assigned. Band origins, effective rotational parameters (B.D), and spin-rotation coupling constants ($\gamma$) of the model Hamiltonian used to describe individual vibrational levels of both states, are determined by linear least-squares fitting of the data of each band. Multiple estimates of the parameters are merged to obtain the best single-valued estimates of the same parameters, as well as Dunham coefficients describing their vibrational dependence. The vibrational dependence of $\gamma^{\prime}$ for the B-state is linear in $\nu^{1}$; for the ground state, no significant dependence of $\gamma^{\prime\prime}$ could be established.""

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Author Institution: Department of Chemistry, Dalhousie University

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