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Thermal properties of Deng–Fan–Eckart potential model using Poisson summation approach

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Abstract

The Deng–Fan–Eckart potential is as good as the Morse potential in studying atomic interaction in diatomic molecules. By using the improved Pekeris-type approximation, to deal with the centrifugal term, we obtain the bound-state solutions of the radial Schrödinger equation with this adopted molecular model via the Factorization Method. With the energy equation obtained, the thermodynamic properties of some selected diatomic molecules (H2, CO, ScN and ScF) were obtained using Poisson summation method. The unnormalized wave function is also derived. The energy spectrum for a set of diatomic molecules for different values of the vibrational n and rotational \(\ell\) are obtained. To show the accuracy of our results, we discuss some special cases by adjusting some potential parameters and also compute the numerical eigenvalue of the Deng–Fan potential for comparison sake. However, it was found out that our results agree excellently with the results obtained via other methods.

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Authors and Affiliations

  1. Theoretical Physics Group, Department of Physics, University of Port Harcourt, Port Harcourt, Nigeria

    C. O. Edet, U. S. Okorie & A. N. Ikot

  2. Department of Physics, Akwa Ibom State University, Ikot Akpaden, Uyo, Nigeria

    U. S. Okorie

  3. Department of Physics, Federal College of Education, Omuku, Rivers State, Nigeria

    G. Osobonye

  4. Department of Physics, University of South Africa, Florida 1710, Johannesburg, South Africa

    A. N. Ikot & G. J. Rampho

  5. Department of Physics, Middle East Technical University, 06800, Ankara, Turkey

    R. Sever

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  1. C. O. Edet
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Edet, C.O., Okorie, U.S., Osobonye, G. et al. Thermal properties of Deng–Fan–Eckart potential model using Poisson summation approach. J Math Chem 58, 989–1013 (2020). https://doi.org/10.1007/s10910-020-01107-4

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