DETERMINATION OF THE POTENTIAL ENERGY CURVE OF THE $D\,^1\Pi$ STATE OF NaK BY TWO-COLOR POLARIZATION LABELING SPECTROSCOPY
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Date
2008
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Publisher
Ohio State University
Abstract
Two-colour polarization labeling experiments measuring the $D\,\leftarrow\,X$ system of NaK have furnished observations of the D $^{1}\Pi$ state of NaK up to v" = 42. The last observed level is located 7 cm$^{-1}$ below the Na(3p $^2P_{3/2}$) + K(4s) atomic asymptote, clearly indicating the dissociation products of this state. The vibrational progressions all exhibit irregular intervals, predominantly because of strong interactions with the nearby d $^3\Pi$ state, which also dissociates to Na(3p) + K(4s) atoms. The polarization data have been combined with some resolved fluorescence $D\,\rightarrow\,X$ transitions, and analyzed by fitting to spectroscopic parameters and to an analytical potential curve. A full deperturbation treatment has not been attempted, but a ``robust'' weighting scheme has been used to reduce the influence of levels that cannot be properly represented by a single channel model. Parameters determined in a fit to a potential curve include $T_e$ = 20090.15 $\pm$ 0.02 cm$^{-1}$, $D_e$ = 2157.0 $\pm$ 0.3 cm$^{-1}$, $R_e$ = 4.155 $\pm$ 0.002 \AA, with an unweighted root mean square error of 0.12 cm$^{-1}$ for 959 data.
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Author Institution: Universite Lyon 1 and CNRS (LASIM, UMR 5579), 69622 Villeurbanne, France; UFR SSMT Universite de Cocody, 22 BP 582 Abidjan, Ivory Coast Republic; Institute of Physics, Polish Academy of Sciences, Al.; Lotnikov 32/46, 02-668 Warsaw, Poland; Institute of Experimental Physics, Warsaw University, ul.; Hoza 69, 00-681 Warsaw, Poland; Department of Chemistry, Moscow State University, 119992; Moscow, Russia