Breier Alexander A, Büchling Thomas, Schnierer Rico, Lutter Volker, Fuchs Guido W, Yamada Koichi M T, Mookerjea Bhaswati, Stutzki Jürgen, Giesen Thomas F
Laboratory Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany.
Physics of New Materials, Institute of Physics, University of Rostock, 18059 Rostock, Germany.
J Chem Phys. 2016 Dec 21;145(23):234302. doi: 10.1063/1.4971854.
The ν lowest bending mode of linear C and of all its C-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.
使用太赫兹超音速喷射光谱仪结合激光烧蚀源，记录了线性碳及其所有碳取代同位素变体的ν最低弯曲模式。已将1.8至1.9太赫兹之间的65个转动-振动跃迁归属于线性C12C12C12、C12C12C13、C12C13C12、C13C13C12、C13C12C13和C13C13C13。对于每个同位素变体，获得了分子参数，并通过实验得出了碳-碳键长。所有结果与最近的从头算计算结果[B. 施罗德和P. 泽巴尔德，《化学物理杂志》144, 044307 (2016)]非常吻合。新的测量结果解释了为何迄今为止在星际空间中寻找单取代的C12C12C13的工作一直没有成功。给出了基于全局数据拟合的推荐跃迁频率的谱线列表，以促进未来的星际探测。
