Abstract
The vibrational partition function is calculated for three diatomic molecules of different character (CO, $$\hbox {H}_{2}^{+}$$ , NH) at extremely high temperatures and contributions of scattering interactions between atoms is analyzed. The classical method with the quantum Wigner-Kirkwood correction is used in version with only bound states and bound plus scattering states generated by rotationless potential energy curve. The partition function based on bound states of the present method is compared with the partition function based on the vibrational levels. It is also found that contribution of scattering states in the vibrational partition function is similar independently of molecule.
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