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Relativistic energies for diatomic molecule nucleus motions with the spin symmetry. (English) Zbl 1304.35592

Summary: The analytical solutions of the Dirac equation with the spin symmetry for the improved Manning-Rosen potential energy model have been explored. We present the bound state energy equation and the corresponding upper and lower radial wave functions. The degeneracy between the two states of the spin doublet for the nucleus motions of the \(\operatorname{X}^1 \Sigma^+\) state of \(\mathrm{SiF}^+\) molecule has been observed. When the vector potential is equal to the scalar potential, the relativistic effect of the nuclear motion leads to a little decrease in the vibrational energies, while to an increase in those if the vector potential is greater than the scalar potential.

MSC:

35Q41 Time-dependent Schrödinger equations and Dirac equations
81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other equations of quantum mechanics
81V55 Molecular physics
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