Microwave measurements of the ground, ν10 =1 and ν10 = 2 vibrational modes of propyne-d3 molecule in the range 14-45 GHz

Abstract EN

Some rotational components in the microwave region for the transitions ΔJ=1←0, ΔJ=2←1 and ΔJ=3←2 have been measured in the ground, the ν10=1 and the ν10=2 vibrational states for CD3CCH isotope in the frequency range 14-45 GHz.

From these components a set of rotational constants has been obtained, which minimizes the discrepancies between the calculated and the measured frequencies down to a few hundred kHz, for each vibrational state.

A Small departure between the calculated and the measured frequencies in few components is found, which is attributed to a Fermi resonance between the ν10=2 and the ν9=1 vibrational states