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The bond stretching vibrations of XF_5 molecules with D_(3h)symmetry are treated computa-tionally on the Morse oscillator model in which the bond oscillators are coupled harmonically.Eachcalculation involves four parameters for two types of Morse potential and three parameters for thekinetic-energy,potontial coupling terms.The eigenvalue formula for overtone and combination statesup to three are presented and can be used to predict all the vibrational energylevels from local modemolecules through normal mode molecules.For PF_5,AsF_5 and VF_5,the coupled Morse oscillatormodel gives a prediction in good agreement with the experimental data.
The bond stretching vibrations of XF_5 molecules with D_ (3h) symmetry are treated computa-tionally on the Morse oscillator model in which the bond oscillator oscillators are coupled harmonically. Eachcalculation involves four parameters for two types of Morse potential and three parameters for thekinetic-energy, potontial coupling terms. The eigenvalue formula for overtone and combination statesup to three are presented and can be used to predict all the vibrational energy levels from local modemolecules through normal mode molecules. FOR PF_5, AsF_5 and VF_5, the coupled Morse oscillator mode gives a prediction in good agreement with the experimental data.