Abstract
This paper continues the theoretical study (see V. P. Bulychev and M. V. Buturlimova, J. Mol. Struct. 928, 32 (2009)) of the isotopic effects in the H-bonded anionic complex [F(HF)2]-. Isotopomers of the complex with significant differences between the masses of the light atoms are considered. The four-dimensional anharmonic vibrational problem are solved by the variational method for the symmetric complex [F(KaF)2]-, in which both protons are substituted by a positive kaon (positive K-meson), and for the asymmetric complex [FKaFTF]-. Variables related to the changes in the lengths of molecular fragments LF (L = Ka and T) and the distances between the F- anion and the centers of mass of LF are used as the vibra-tional coordinates. The potential energy surfaces are calculated in the MP2/6-311++G(3df,3pd) approximation taking into account the basis set superposition error. The vibrational energy levels, frequencies, and absolute intensities for spectral transitions are determined. To study the isotope effect on the geometrical parameters of the complex, the values of internuclear separations and the asymmetry parameter of the F-…L-F bridge averaged over the ground state and several excited vibrational states are calculated, as well as their standard deviations. The calculated results are compared to the data obtained previously for the symmetric complexes [F(HF)2]-, [F(DF)2]-, and [F(TF)2]-.
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Original Russian Text © V.P. Bulychev, M.V. Buturlimova, K.G. Tokhadze, 2010, published in Optika i Spektroskopiya, 2010, Vol. 108, No. 6, pp. 931–940.
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Bulychev, V.P., Buturlimova, M.V. & Tokhadze, K.G. Influence of isotopic substitution on spectral and structural parameters of an isolated [F(HF)2]— complex. Substitution of a proton by a kaon and a triton. Opt. Spectrosc. 108, 883–892 (2010). https://doi.org/10.1134/S0030400X1006010X
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DOI: https://doi.org/10.1134/S0030400X1006010X