A high-resolution spectrum in the region of 2144 cm(-1) is assigned to the previously elusive CO trimer. In spite of interference from the CO dimer and some remaining unexplained details, there is strong evidence for a planar, cyclic, C-bonded trimer structure, with C(3h) symmetry and 4.42 Å intermolecular separation, in agreement with theoretical calculations. A modest vibrational blueshift of +0.85 cm(-1) is observed for the CO trimer, as compared to +0.71 cm(-1) for the C-bonded form of the dimer.
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| http://dx.doi.org/10.1063/1.4793220 | DOI Listing |
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