IRC +10216中的镁基MgC $_5$ N和MgC $_6$ H
Magnesium radicals MgC$_5$N and MgC$_6$H in IRC+10216
摘要：
在IRC+10216中发现MgC $_3$ N和MgC $_4$ H之后，对该源进行更深的Q波段（31.0-50.3 GHz）积分，揭示了另外两个系列的谐波相关双峰，我们根据量子力学计算将其分配给较大的自由基MgC $_5$ N和MgC $_6$ H。本文的结果扩展和证实了以前在IRC\，+10216中关于含镁分子的结果。我们推导出MgCl 2 $_5$ N的（4.7 $\pm$ 1.3）$\times$ 10 $^{12}$和MgCl 2 $_6$ H的（2.0 $\pm$ 0.9）$\times$ 10 $^{13}$的柱密度，这意味着MgCl 2 $_5$ N/MgCl 2 $_3$ N=0.5和MgCl 2 $_6$ H/MgCl 2 $_4$ H = 0.9。因此，MgCl 2 $_5$ N和MgCl 2 $_6$ H的柱密度与直接较短的类似物的柱密度没有太大差异。IRC+10216中这些大的镁氰化物和乙炔化物的合成可以解释为它们的较短的对应物，通过Mg $^+$与大的氰基多炔和多炔（在该来源中仍然相当丰富）的辐射缔合引发的两步过程，随后是离子络合物的解离重组。
英文摘要：
After the previous discovery of MgC$_3$N and MgC$_4$H in IRC+10216, a deeper Q-band (31.0-50.3 GHz) integration on this source had revealed two additional series of harmonically related doublets that we assigned on the basis of quantum mechanical calculations to the larger radicals MgC$_5$N and MgC$_6$H. The results presented here extend and confirm previous results on magnesium-bearing molecules in IRC\,+10216. We derived column densities of (4.7$\pm$1.3)$\times$10$^{12}$ for MgC$_5$N and (2.0$\pm$0.9)$\times$10$^{13}$ for MgC$_6$H, which imply that MgC$_5$N/MgC$_3$N=0.5 and MgC$_6$H/MgC$_4$H = 0.9. Therefore, MgC$_5$N and MgC$_6$H are present with column densities not so different from those of the immediately shorter analogs. The synthesis of these large magnesium cyanides and acetylides in IRC+10216 can be explained for their shorter counterparts by a two-step process initiated by the radiative association of Mg$^+$ with large cyanopolyynes and polyynes, which are still quite abundant in this source, followed by the dissociative recombination of the ionic complexes.
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