title: Infrared signatures of the NCCO radical.
abstract: The first definitive infrared signatures of the elusive NCCO radical have been measured using a microwave discharge technique combined with low-temperature matrix-isolation spectroscopy, resulting in a consistent set of vibrational assignments for six isotopologues. The infrared spectra of these NCCO isotopologues were concomitantly established by rigorous variational nuclear-motion computations based on a high-level coupled-cluster quartic vibrational force field [ROCCSD(T)/cc-pCVQZ] and cubic dipole field [ROCCSD/cc-pCVTZ]. Our experimental and theoretical results for NCCO overturn the vibrational assignments in a NIST-JANAF compilation and those from a recent two-dimensional cross-spectral correlation analysis. For the parent isotopologue at 11 K in a nitrogen matrix, we find the signature bands nu(2)(CO str.) = 1889.2 cm(-1) and nu(3)(CC str.) = 782.0 cm(-1). Our variational vibrational computations reveal strong mixing of the nu(3) stretching fundamental and the nu(4) + nu(5) bending combination level for all isotopologues. These Fermi resonances manifest a clear breakdown of the simple normal-mode picture of molecular vibrations at low energies.
authors.affiliation: Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany. prs@org.chemie.uni-giessen.de
authors.forename: Peter R
authors.initials: PR
authors.lastname: Schreiner
authors.forename: Hans Peter
authors.initials: HP
authors.lastname: Reisenauer
authors.forename: Edit
authors.initials: E
authors.lastname: Mátyus
authors.forename: Attila G
authors.initials: AG
authors.lastname: Császár
authors.forename: Ali
authors.initials: A
authors.lastname: Siddiqi
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Simmonett
authors.forename: Wesley D
authors.initials: WD
authors.lastname: Allen