Dipole moment of methanol by microwave stark spectroscopy IV: 13CD316OH species

• Precise Dipole Moment Components of 13CD3OH have been reported.
• A significant change is observed for Dipole moment from other isotopic variants.
• The Theory explained accurately describe the observe effects.
• The Extrapolated Zero Field Frequencies with accuracy on the order of 50 kHz.
• The results will prove valuable for radio astronomy.

In this work, Stark effect measurements have been carried out on several transitions C-13 substituted species of triply-deuterated (D3) methanol. The analysis of the data allowed the determination of the dipole moment components in the first two torsional states of the ground vibrational state of this species. The extrapolated zero field frequencies of the transitions studied have been determined and found to be in excellent agreement with known values. For the torsional ground state the values {in Debye (D)} of μa = 0.9080(9) and μb = 1.4378(10) have been obtained for this species. These values increase for the first excited state as was observed for other species. The dipole moment values are considerably higher than the non-deuterated species. To our knowledge the present study represents the measurement of the most accurate dipole moment values of 13CD3OH for the first time. The results obtained will prove useful for radio astronomy and in understanding of large amplitude internal energy pathways in polyatomic molecules.

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