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Creators: Ross, A. J.; Martin, F.; Crozet, P.; Aubert-Frécon, M.; Kowalczyk, Pawel; Jastrzębski, Wlodzimierz; Pashov, A.
Issue Date: 2001
Publisher: Ohio State University
Abstract: Laser-induced fluorescence spectra of the $B \rightarrow X$ system of the potassium-lithium molecule have been recorded on a Fourier transform interferometer. The molecules were excited with a tuneable, single-mode cw dye laser operating with Rhodamine 110 or Coumarine 6 dye, and the spectra recorded in the range $12500 - 18500 cm^{-1}$ at a resolution of $0.05 cm^{-1}$. Vibrational levels up to $v = 46$ are observed for the main isotopomer, $^{39}K^{7}Li$. Ground state energies have been fitted to a Dunham polynomial expansion, and also directly to a pointwise potential curve. Both approaches fit the data with a root-mean-square error of $0.005 cm^{-1}$. The data define the ground state potential curve accurately out to about 7 \AA. The dissociation energy of the ground state $D_{e}$ is estimated to be $D_{e} = 6216 \pm 2 cm^{-1}$, and the highest vibrational level $v_{max} = 50$ for the main isotopomer. Very weak transitions around $12600 cm^{-1}$ are tentatively assigned as bands of the $2 ^{3}\Sigma^{+} \rightarrow 1 ^{3}\Sigma^{+}$ transition, observed as collisionally induced fluorescence.
URI: http://hdl.handle.net/1811/20266
Other Identifiers: 2001-TH-06
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