Abstract
The far infrared spectrum of the NO dimer in the gas phase has been observed for the first time, using a low temperature (100 K) long-path (180 m) absorption cell. The spectroscopic results are used, together with mid-infrared observations and high level CCSD(T) ab initio calculations, to locate the four low frequency intermolecular vibrational modes of (NO)2: ν2 (symmetric bend)=239.361 cm−1, ν3 (intermolecular stretch)=134.503 cm−1, ν4 (out-of-plane torsion)≈117 cm−1, and ν6 (antisymmetric bend)=429.140 cm−1. These values agree poorly with previous determinations based on condensed-phase spectra, indicating that there are large shifts in going from the isolated gas-phase dimer to the liquid, solid, or matrix-isolated environments.
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