The 103–360 GHz rotational spectrum of benzonitrile, the first interstellar benzene derivative detected by radioastronomy

The 103–360 GHz rotational spectrum of benzonitrile, the first interstellar benzene derivative detected by radioastronomy
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苯甲腈的 103-360-GHz 旋转光谱,第一个通过射电天文学检测到的星际苯衍生物

DOI:
10.1016/j.jms.2018.06.004
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发表时间:
2018
影响因子:
1.4
通讯作者:
Kisiel, Zbigniew
Kisiel, Zbigniew
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zdanovskaia, Maria A.;Esselman, Brian J.;Lau, Hunter S.;Bates, Desiree M.;Woods, R. Claude;McMahon, Robert J.;Kisiel, Zbigniew

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最近,在星际介质(TMC-1)中探测到了几个苯甲腈的厘米波跃迁。本文报道了平面非对称转子分子苯甲腈(C6 H5 CN,C2 v,μ a= 4.5D)在103-360 GHz频率范围内的毫米波光谱。超过3000个旋转跃迁已被新测量的基态,并结合以前的数据在一个全球性的拟合,这使得预测的低温超精细解决和高频未解决的旋转光谱。在最低基元ν 22和ν 33(分别为141和163 cm− 1)中的转动跃迁是首次被观测到的,并通过识别几个由强态间混合引起的名义态间跃迁得到补充。在实验精度范围内,应用两态科里奥利耦合模型解释了许多已识别的状态间扰动,导致ΔE 22,33= 19.108185(7)cm-1,|第22、33 a条|= 0.841(7)。这项研究提供了深入了解影响这类分子的最低激发振动态的一般性问题,并描述了使其成功分析的技术。新数据为未来苯甲腈的远程检测应用提供了基础。
Recently, several cm-wave transitions of benzonitrile have been detected in the interstellar medium (TMC-1). In this work, the mm-wave spectrum of benzonitrile (C 6 H 5 CN, C 2v, μ a= 4.5 D), a planar asymmetric rotor molecule, is reported in the 103–360 GHz frequency region. Over 3000 rotational transitions have been newly measured for the ground state and were combined with previous data in a global fit, which allows predictions of both low-temperature hyperfine resolved and high-frequency unresolved rotational spectra. Rotational transitions in the lowest fundamentals, ν 22 and ν 33 (141 and 163 cm− 1, respectively), have been observed for the first time, and were complemented by identification of several nominal interstate transitions resulting from strong interstate mixing. Application of a two-state, Coriolis-coupled model accounted, to within experimental precision, for many identified interstate perturbations resulting in ΔE 22, 33= 19.108185 (7) cm− 1 and| ζ 22, 33 a|= 0.841 (7). This study provides insight into the generic problem affecting the lowest excited vibrational states of this molecular class and describes the techniques allowing its successful analysis. The new data provide the foundation for future remote detection applications of benzonitrile.
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