论文标题
在TMC-1中发现新的分子离子HC7NH+
Discovery of a new molecular ion, HC7NH+, in TMC-1
论文作者
论文摘要
我们报告了TMC-1中HC7N的质子化形式的检测。阳离子HC7NH+的发现是通过使用Yebes 40m radiotelescope观察Q波段中的九个和谐相关线进行的。观察到的频率使我们能够获得旋转常数B_0 = 553.938802（160）MHz和D_0 = 3.6292（705）Hz。精确的Ab从头算法进一步支持HC7NH+的识别。我们得出了（5.5 +/- 0.7）E10 cm-2的色谱柱密度，该密度构成了识别载体的另一个证据。此外，我们修改了HC7N色谱柱密度，并得出了（2.1 +/- 0.2）E13CM-2的新值。因此，丰度HC7N/HC7NH+的丰度比为380，而HC3N/HC3NH+和HC5N/HC5NH+分别为230和240。在这里，我们在冷致密云中质子化分子的化学模型的框架内讨论了这些结果。
We report the detection of the protonated form of HC7N in TMC-1. The discovery of the cation HC7NH+ was carried out via the observation of nine harmonically related lines in the Q-band using the Yebes 40m radiotelescope. The observed frequencies allowed us to obtain the rotational constants B_0=553.938802(160)MHz and D_0=3.6292(705) Hz. The identification of HC7NH+ is further supported by accurate ab initio calculations. We derived a column density of (5.5+/-0.7)e10 cm-2, which constitutes another piece of evidence for the identification of the carrier. In addition, we revised the HC7N column density and we derived a new value of (2.1+/-0.2)e13cm-2. Hence, the abundance ratio HC7N/HC7NH+ is 380, while those for HC3N/HC3NH+ and HC5N/HC5NH+ are 230 and 240, respectively. Here, we discuss these results within the framework of a chemical model for protonated molecules in cold dense clouds.
