PREDISSOCIATION IN THE $A^{2}\Sigma^{+}$ STATE OF $HBr^{+}$.

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1969

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Ohio State University

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A break-off in the rotational spectrum for the $A^{2}\Sigma^{+} \rightarrow X^{2}\Pi_{1}$ transition of $HBr^{+}$ has been observed. This break-off has been seen in the v = 1 and v = 0 vibrational levels of $HBr^{+}$ and the $v = 2$ level of $DBr^{+}$. Analysis of the data shows that the predissociating state is stable and is probably $a ^{4}II$ state. There is a possibility that a maximum occurs in the potential curve of the predissociating state. Using this information and other spectroscopic data, we have determined dissociation energies for the $A^{2}\Sigma^{+}$ and $X^{2}\Pi_{1}$ states of $HBr^{+}$ and an ionization potential for HBr. The ionization potentials agree well with the results of photo-electron $spectroscopy.^{1}$.

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M. Haugh was supported by a NASA Predoctoral Fellowship. Present address of M. Haugh is the Department of Chemistry, Temple University, Philadelphia, Penna., 19122. $^{1}$ D.C. Frost, C.A. McDowell and D.A. Vroom, J. Chem. Phys. 46, 4255 (1967).
Author Institution: Department of Chemistry, Temple University; Department of Chemistry, University of California at Los Angeles

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