Effective Hamiltonian for rovibrational energies and line intensities of carbon dioxide

Abstract The reduced form of Chedin effective Hamiltonian for CO2 molecule (J. Mol. Spectrosc., 76, 430–491 (1979)) has been suggested for fitting to the spectroscopic constants Gv, Bv, Dv, and Hv of the ground electronic state. Formulas relating parameters of reduced and unreduced effective Hamiltonians have been established. The sets of parameters for both Hamiltonians are presented. They are related with a reasonable accuracy by means of established formulas. The influence of the effective Hamiltonian transformations on the parameters of the effective dipole moment operator and of its matrix elements has been studied.

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