同位素丙酮、CH $_3^{13}$ C（O）CH $_3$和$^{13}$ CH $_3$ C（O）CH $_3$和人马座B2（N2）的实验室旋转光谱学和天文学搜索
Laboratory rotational spectroscopy of isotopic acetone, CH$_3^{13}$C(O)CH$_3$ and $^{13}$CH$_3$C(O)CH$_3$, and astronomical search in Sagittarius B2(N2)
摘要：
我们想研究CH $_3^{13}$ C（O）CH $_3$和$^{13}$ CH $_3$ C（O）CH $_3$的转动光谱，并在人马座B2（N2）中寻找它们。为了研究天然同位素组成中的$^{13}$ CH $_3$ C（O）CH $_3$，我们研究了40 ~ 910 GHz和36 ~ 910 GHz的实验室转动光谱。此外，我们还在利用ALMA对人马座B2（N）进行的分子谱线调查中寻找了这些物种产生的发射谱线。主要同位素物种和ALMA光谱的预测之间的差异促使我们重新审视这个同位素的旋转光谱。在实验室光谱中，我们对CH $_3^{13}$ C（O）CH $_3$的9711个新跃迁和$^{13}$ CH $_3$ C（O）CH $_3$的63个新跃迁进行了归属。超过1000条额外的线被分配给主要的同位素物种。我们用ERHAM程序对这三种同位素的基态数据进行了满意的模拟。我们发现，扭转激发态$v _{12} = 1$和$v _{17} = 1$的CH $_3$ C（O）CH $_3$模型的改善只是微不足道的。没有明显检测到CH $_3^{13}$ C（O）CH $_3$向热分子核Sgr B2（N2）的跃迁。然而，我们报告了一个初步检测的$^{13}$ CH $_3$ C（O）CH $_3$与$^{12}$ C/ $^{13}$ C同位素比为27，这是与以前测量的比例醇在这个来源。几十个过渡的两个扭转状态的主要同位素检测以及。我们对CH $_3^{13}$ C（O）CH $_3$和CH $_3$ C（O）CH $_3$的预测在太赫兹区域是可靠的。$^{13}$ CH $_3$ C（O）CH $_3$的光谱应在实验室用富集样品重新检查。在人马座B2（N2）中可以明确地识别出与CH $_3$ C（O）CH $_3$的扭转激发态$v _{12} = 1$和$v _{17} = 1$有关的跃迁。
英文摘要：
We want to study the rotational spectra of CH$_3^{13}$C(O)CH$_3$ and $^{13}$CH$_3$C(O)CH$_3$ and search for them in Sagittarius B2(N2). We investigated the laboratory rotational spectrum of isotopically enriched CH$_3^{13}$C(O)CH$_3$ between 40 GHz and 910 GHz and of acetone between 36 GHz and 910 GHz in order to study $^{13}$CH$_3$C(O)CH$_3$ in natural isotopic composition. In addition, we searched for emission lines produced by these species in a molecular line survey of Sagittarius B2(N) carried out with ALMA. Discrepancies between predictions of the main isotopic species and the ALMA spectrum prompted us to revisit the rotational spectrum of this isotopolog. We assigned 9711 new transitions of CH$_3^{13}$C(O)CH$_3$ and 63 new transitions of $^{13}$CH$_3$C(O)CH$_3$ in the laboratory spectra. More than 1000 additional lines were assigned for the main isotopic species. We modeled the ground state data of all three isotopologs satisfactorily with the ERHAM program. We find that models of the torsionally excited states $v _{12} = 1$ and $v _{17} = 1$ of CH$_3$C(O)CH$_3$ improve only marginally. No transition of CH$_3^{13}$C(O)CH$_3$ is clearly detected toward the hot molecular core Sgr B2(N2). However, we report a tentative detection of $^{13}$CH$_3$C(O)CH$_3$ with a $^{12}$C/$^{13}$C isotopic ratio of 27 that is consistent with the ratio previously measured for alcohols in this source. Several dozens of transitions of both torsional states of the main isotopolog are detected as well. Our predictions of CH$_3^{13}$C(O)CH$_3$ and CH$_3$C(O)CH$_3$ are reliable into the terahertz region. The spectrum of $^{13}$CH$_3$C(O)CH$_3$ should be revisited in the laboratory with an enriched sample. Transitions pertaining to the torsionally excited states $v _{12} = 1$ and $v _{17} = 1$ of CH$_3$C(O)CH$_3$ could be identified unambiguously in Sagittarius B2(N2).
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