Abstract

The FTIR spectrum of the deuterated formic acid HCOOD was measured in the region 1050–1300 cm−1 with resolution ca. 0.003 cm−1. Combined analysis of the 3579 assigned infrared transitions of the ν5 band centered at 1177.1 cm−1 and 52 millimeter-wave rotational transitions belonging to the v5=1 vibrational state made it possible to improve rotational, quartic, and sextic centrifugal distortion parameters. The RMS deviation of the IR transitions is 0.000240 cm−1. The maximum value of J′ is 67.

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