FOURIER TRANSRORM EMISSION SPECTROSCOPY HfH AND HfD
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Date
1994
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Ohio State University
Abstract
The electronic emission spectra of HfH and HfD were investigated in the 476 nm to 1 $\mu$ spectral region using a Fourier transform spectrometer. The bands were excited in a hafnium hollow cathode lamp in the presence of a mixture of neon and $H_{2}$ of $D_{2}$ For HfH two $\Delta \Omega=0$ electronic transitions with a common $\Omega^{\prime\prime}=3/2$ lower state, most probably the $X^{2} \Delta_{3/2}$ ground state, were identified at $14495 cm^{-1}$ and $19147 cm^{-1}$. These bands have been assigned as the $[14.5]3/2- X^{2} \Delta_{3/2}$ and the $[19.1]- X^{2} \Delta_{3/2}$ transitions. The rotational analysis of the 0-0 and 1-1 bands of the $[14.5]3/2 -X^{2} \Delta_{3/2}$ system and the 0-0 band of the $[19.1]3/2 - X^{2} \Delta_{3/2}$ system provides the following equilibrium constants for the ground state of HfH: \[ B_{e}{^{\prime\prime}} = 5.01911(8) cm^{-1}, \alpha_{e}{^{\prime\prime}} = 0. 12026(11)\ cm^{-1} \ { and} \ r_{e}{^{\prime\prime}} = 1. 830691(15) \textrm{\AA}. \] For HfH only the 0-0 band of the $[19.1]3/2-X^{2} \Delta_{3/2}$ transition at $19134 cm^{-1}$ was identified. This work represents the first observation of the HfH and the HfD molecules.
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Author Institution: Department of Chemistry, University of Arizona; Department of Chemistry, University of Waterloo