ON THE POSSIBILITY OF A MAXIMUM IN THE POTENTIAL CURVE FOR THE $c^{1}II$ STATE OF NH
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Date
1968
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Ohio State University
Abstract
Although there is no obvious diffuseness or breaking-off in the rotational structure of observed band systems, the energies of the observed rotational levels and a comparison of the $d^{1}\Sigma^{+}- c^{1}II$ bands with possible Franck-Condon factors suggest that the $c^{1}II$ state of NH predissociates by rotation. The limiting curves of dissociation for NH and ND provide evidence for a maximum in the rotationless potential curve, at an internuclear distance of $1.90 {\AA}$. If this is so, then $D^{0}(MH c^{1}II)$ is less than $4300 cm^{-1}$. Such an interpretation is consistent with the $X^{3}\Sigma^{-}$ ground state dissociation energy of $3.21eV (25900 cm^{-1})$ found by Seal and Gaydon (1966) and recent calculations of the energy separation of the singlet and triplet states.
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Author Institution: Center for Research in Experimental Space Science, York University