Abstract
The highly sensitive method of infrered-radiofrequency double resonance inside a carbon dioxide laser cavity has been used to observe direct K-type doubling transitions in formic acid. Radiofrequency transitions corresponding to both ν 6 and ν 8 bands were observed. In the light of these new data some earlier infrared laser measurements are now assigned unambiguously. This results in greatly improved band parameters and a ν 6 ν 8 a-type Coriolis coupling constant that is 10 times better defined.
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