论文标题
发现两个新的星际分子与Quijote：HCCCCCC和HCCCCS
Discovery of two new interstellar molecules with QUIJOTE: HCCCHCCC and HCCCCS
论文作者
论文摘要
我们报告了两个新分子HCCCCCC和HCCCC的发现，该分子从Quijote Line调查中的金牛座区域中的无星核TMC-1中的31.1-50.2 GHz频率范围中发现。我们总共确定了29行HCCCCCC和HCCCC的六个旋转过渡。 HCCCCCC的旋转量子数从JU = 10到15至15，而HCCCCS的JU = 21/2范围为31/2。我们得出了n =（1.3 +/- 0.2）x10^11 cm-2的HCCCHCCC的列密度，旋转温度为6 +/- 1 K，而对于HCCCCS，我们得出了N =（9.5 +/- 0.8）x10^10 cm-2和Trot = 10 +/- 1K。最近发现了HCCCCCC的含量比HCCCC更高。如果我们将HCCCC与其相关分子，HCS和HCCS进行比较，则获得了丰度比HCS/HCCCCS = 58，HCCS/HCCCCS = 7.2。我们使用化学建模计算研究了这两个分子的形成。观察到的丰度可以通过假设涉及中性反应和离子中性反应的标准气相形成途径来解释。
We report on the discovery of two new molecules, HCCCHCCC and HCCCCS, towards the starless core TMC-1 in the Taurus region from the QUIJOTE line survey in the 31.1-50.2 GHz frequency range. We identify a total of twenty-nine lines of HCCCHCCC and six rotational transitions of HCCCCS. The rotational quantum numbers range from Ju=10 up to 15 and Ka <=2 for HCCCHCCC and Ju=21/2 up to 31/2 for HCCCCS. We derived a column density for HCCCHCCC of N=(1.3+/-0.2)x10^11 cm-2 with a rotational temperature of 6+/-1 K, while for HCCCCS we derived N=(9.5+/-0.8)x10^10 cm-2 and Trot =10+/-1 K. The abundance of HCCCHCCC is higher than that of its recently discovered isomer, l-H2C6. If we compare HCCCCS with its related molecules, HCS and HCCS, we obtain abundance ratios HCS/HCCCCS=58 and HCCS/HCCCCS=7.2. We investigated the formation of these two molecules using chemical modelling calculations. The observed abundances can be accounted for by assuming standard gas-phase formation routes involving neutral-neutral reactions and ion-neutral reactions.
