title: The nu(5) antisymmetric stretching mode of linear C(7) revisited in high resolution.
abstract: The nu(5) antisymmetric stretching mode of the linear carbon cluster C(7) has been revisited using a sensitive high-resolution spectrometer, including an external-cavity quantum cascade laser covering the range of interest of 1894-1901 cm(-1). 50 transitions of the nu(5)-band have been recorded and analyzed together with 45 transitions of the nu(4)-band measured by Neubauer-Guenther et al. [J. Chem. Phys. 127, 014313 (2007)]. We determined the band centers, rotational and centrifugal constants very precisely. In addition, 29 hot band transitions have been measured and tentatively assigned to the nu(5)+nu(11)-nu(11) hot band. A global fit of the hot bands nu(5)+nu(11)-nu(11) and nu(4)+nu(11)-nu(11) is presented. Derived l-type doubling constants allow for an experimental estimation of the nu(11)-band center.
authors.affiliation: I. Physikalisches Institut, Universität zu Köln, Germany. krieg@ph1.uni-koeln.de
authors.forename: J
authors.initials: J
authors.lastname: Krieg
authors.forename: V
authors.initials: V
authors.lastname: Lutter
authors.forename: F-X
authors.initials: FX
authors.lastname: Hardy
authors.forename: S
authors.initials: S
authors.lastname: Schlemmer
authors.forename: T F
authors.initials: TF
authors.lastname: Giesen