CO dimer: the infrared spectrum revisited
- Rezaei, Mojtaba
- Sheybani-Deloui, S.
- Moazzen-Ahmadi, N.
- Michaelian, K. H.
- McKellar, A. R. W.
DOIAbstract
A broad-band (2135-2200 cm-\ub9) infrared spectrum of the CO dimer is recorded using a tunable quantum cascade laser to probe a supersonic jet expansion with an effective rotational temperature of about 2.5 K. Analysis of the spectrum reveals the first known levels of the excited state (vCO = 1) with A+ symmetry and establishes that resonant vibrational splittings are small (<0.2 cm-\ub9) for both the C-bonded and O-bonded dimer isomers. The spectrum extends over a surprisingly large range, with somewhat reduced intensity above 2150 cm-\ub9. A total of 28 new "stacks" of rotational levels having A- symmetry are assigned for vCO = 1 on the basis of combination differences, adding to the 8 stacks previously known, and extending up to 51 cm-\u...
Add to ORKG