MOLECULAR-PARAMETERS OF (CD3OD)-C-13

In a recent letter Jackson et al. [1] have reported the observation of the far-infrared (FTR) laser Stark spectra in (CD3OD)-C-13 species of methanol for the first time, corresponding to the Q-branch transition J(K) = J(5) <-- J(4)E(2) in the first excited torsional state (v(t) = 1) for the J = 9-15 members, using the HCN laser. The molecular param eters used for the predictions have been obtained from the extrapolati on from other molecular species, It is pertinent to note that the pred ictions were accurate enough to make the assignments straightforward ( G.R. Sudhakaran, private communication). With the availability of the zero field frequencies for the Q-branch multiplets, the molecular para meters have been improved. In this letter the molecular parameters for (CD3OD)-C-13 are reported for the first time. In addition, comments a re also made on the FIR laser lines reported to be pumped in (CD3OD)-C -13 with a CO2 laser. (C) 1997 Elsevier Science B.V.