title: Lowest bending mode of13C-substituted C3and an experimentally derived structure.
abstract: The ν2lowest bending mode of linear C3and of all its13C-substituted isotopologues was recorded using a terahertz-supersonic jet spectrometer in combination with a laser ablation source. Sixty-five ro-vibrational transitions between 1.8 and 1.9 THz have been assigned to linear C12C12C12, C12C12C13, C12C13C12, C13C13C12, C13C12C13, and C13C13C13. For each isotopologue, molecular parameters were obtained and the C-C-bond length was derived experimentally. All results are in excellent agreement with recent ab initio calculations [B. Schröder and P. Sebald, J. Chem. Phys. 144, 044307 (2016)]. The new measurements explain why the interstellar search for singly substituted C12C12C13 has failed so far. A spectral line list with recommended transition frequencies based on global data fits is given to foster future interstellar detections.
authors.affiliation: Laboratory Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany.
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Breier
authors.affiliation: Laboratory Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Büchling
authors.affiliation: Physics of New Materials, Institute of Physics, University of Rostock, 18059 Rostock, Germany.
authors.forename: Rico
authors.initials: R
authors.lastname: Schnierer
authors.affiliation: Laboratory Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany.
authors.forename: Volker
authors.initials: V
authors.lastname: Lutter
authors.affiliation: Laboratory Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany.
authors.forename: Guido W
authors.initials: GW
authors.lastname: Fuchs
authors.affiliation: EMTech, AIST, Onogawa 16-1, Tsukuba 305-8569, Japan.
authors.forename: Koichi M T
authors.initials: KM
authors.lastname: Yamada
authors.affiliation: Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.
authors.forename: Bhaswati
authors.initials: B
authors.lastname: Mookerjea
authors.affiliation: I. Physikalisches Institute, Universität zu Köln, 50937 Köln, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Stutzki
authors.affiliation: Laboratory Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany.
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Giesen