Abstract
The 7 1 and 9 1 vibrational states of deuterated species of formic acid molecule DCOOH have been recorded by a FTIR spectrometer in the region 450– 820 cm −1 at a resolution of 0.00125 cm −1 and a millimeter wave spectrometer. In the analysis microwave transitions from literature were used in addition to 14 835 assigned IR and 114 millimeter wave lines in the 7 1 and 9 1 vibrational states. The analysis resulted in band origins, rotational, centrifugal distortion, and eight interaction parameters of the Coriolis coupled 7 1 and 9 1 vibrational states. RMS deviation of the fit was 0.000176 cm −1 for the IR data and the maximum values of J and K a quantum numbers in the fit were 64, 28 and 64, 30 for 7 1 and 9 1 states, respectively.
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