title: Rotational spectrum of cis-cis HOONO.
abstract: The pure rotational spectrum of cis-cis peroxynitrous acid, HOONO, has been observed. Over 220 transitions, sampling states up to J'=67 and Ka'=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 Delta=0.075667(60) amu A2 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.
authors.affiliation: California Institute of Technology, Jet Propulsion Laboratory, Pasadena, California 91109, USA.
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Drouin
authors.forename: Juliane L
authors.initials: JL
authors.lastname: Fry
authors.forename: Charles E
authors.initials: CE
authors.lastname: Miller