title: Communication: Spectroscopic evidence for a planar cyclic CO trimer.
abstract: 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.
authors: Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada.
authors: Mojtaba
authors: M
authors: Rezaei
authors: S
authors: S
authors: Sheybani-Deloui
authors: N
authors: N
authors: Moazzen-Ahmadi
authors: K H
authors: KH
authors: Michaelian
authors: A R W
authors: AR
authors: McKellar