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Rotational spectrum of cis – cis HOONO

Drouin, B., J. L. Fry, and C. E. Miller (2004), Rotational spectrum of cis – cis HOONO, J. Chem. Phys., 120, 5505-5508, doi:10.1063/1.1687311.

The pure rotational spectrum of cis–cis peroxynitrous acid, HOONO, has been observed. Over 220 transitions, sampling states up to J'=67 and K'a=31, have been fitted with an rms uncertainty of 48.4 kHz. The experimentally determined rotational constants agree well with ab initio values for the cis–cis conformer, a five-membered ring formed by intramolecular hydrogen bonding. The small, positive inertial defect Δ=0.075667(60) amu Å2 and lack of any observable torsional splittings in the spectrum indicate that cis–cis HOONO exists in a well-defined planar structure at room temperature.

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Research Program: 
Atmospheric Composition Modeling and Analysis Program (ACMAP)
Upper Atmosphere Research Program (UARP)