# THE $(1)^{1}\Pi_{g}$ STATE OF ${^{39}}K_{2}$ REVISITED

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 dc.creator Russier, I. en_US dc.creator Aubert-Frécon, M. en_US dc.creator Ross, A. J. en_US dc.creator Martin, F. en_US dc.creator Yiannopoulou, A. en_US dc.creator Crozet, P. en_US dc.date.accessioned 2006-06-15T19:07:11Z dc.date.available 2006-06-15T19:07:11Z dc.date.issued 1998 en_US dc.identifier 1998-TC-08 en_US dc.identifier.uri http://hdl.handle.net/1811/19022 dc.description $^{a}$ Current address: Laboratoire Aim\'{e} Cotton (CNRS UPR3321), Campus d'Orsay, B\^{a}timent 505, 91405 Orsay, France en_US dc.description Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire (CNRS UMR5579), and Universit\'{e} Lyon I, Campus la Doua en_US dc.description.abstract Vibrational levels up to $v=107$ of the $(1)^{1}\Pi_{g}$ state of ${^{39}}K_{2}$, which dissociates to $K(4s)^{2}S +K(4p)^{2}P_{3/2}$, have been observed in high resolution Fourier transform records of $C^{1}\Pi_{u}\rightarrow (1)^{1 \Pi_{g}}$ fluorescence of potassium molecules in a heatpipe source. From a revised analysis of this system, we have constructed a rotationless RKR potential curve which extends to $R=40.3$ {\AA} covering 99.2\% of the $(1)^{1}\Pi_{g}$ state. Vibrational and rotational constants (at $J=0$) have been calculated from this curve. The parameters describing the coulombic interactions between $K(4s) + K(4p)$ atoms are given in a Hund's case (c) basis. From this work, the dissociation energy $D_{e}$ for the $(1)^{1}\Pi_{g}$ state is found to be $1290.30 \pm 0.09 cm^{-1}$ (leading to a new value of $T_{e} = 16203.25 \pm 0.09 cm^{-1}$ for this state) and the long-range parameters are $M^{2} = 25.30 \pm 0.02 e^{2}a^{2}_{o},R_{01}= 7261 \pm 223 e^{2}a^{5}_{o}$. These values are in good agreement with values obtained from the pure long range $0^{+}_{g}$ state analyzed by H. Wang, P.L. Gould and W.C. Stwalley (J. Chem. Phys. 106, 7899 (1997)). en_US dc.format.extent 121310 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE $(1)^{1}\Pi_{g}$ STATE OF ${^{39}}K_{2}$ REVISITED en_US dc.type article en_US