Intermolecular vibrational frequencies of the C-bonded CO2CO dimer and observation of HeCO2CO trimers

- Determination of intermolecular mode frequencies for the lowest energy C-bonded form of COCO2.
- Values of 24.34 cm−1 for the in-plane CO rock and 43.96 cm−1 for the out-of-plane CO rock were measured.
- New results are reported for two isomers of 12C18O2-substituted of the COCO2.
- Weak bands were tentatively assigned to two isomers of HeCO2CO trimer.