同位素乙烯基氰H $_2$ C= CH $-$ C $\equiv$ N在实验室和空间中的转动光谱学
Rotational spectroscopy of isotopic vinyl cyanide, H$_2$C=CH$-$C$\equiv$N, in the laboratory and in space
摘要：
在64 ~ 351 GHz的自然丰度范围内研究了乙烯基氰的单取代$^{13}$ C和$^{15}$ N同位素物种的转动光谱。结合以前的结果，已经获得了大大改进的光谱参数，这反过来又有助于通过在3 mm区域中对极富线星际源人马座B2（N）的分子线调查以及在2 mm处的一些额外观测首次在空间中识别$^{13}$ C物种的跃迁。（$\sim 2.3''$）、热（170 K）芯，柱密度分别为$\sim 3.8 \times 10^{16}$和$1.1 \times 10^{16}$ cm $^{-2}$。在主要来源中，所谓的“大分子Heimat”，我们推导出每个$^{13}$ C物种相对于H $_2$的$2.9 \times 10^{-9}$丰度。测得的同位素比$^{12}$ C/ $^{13}$ C为21。通过与这次调查中还检测到的乙腈的$^{13}$ C物种的柱密度的比较，提出Sgr B2（N）的两个热核处于不同的演化阶段。92和342千兆赫之间记录的主要同位素物种的补充实验室数据允许其光谱参数的改善。
英文摘要：
The rotational spectra of singly substituted $^{13}$C and $^{15}$N isotopic species of vinyl cyanide have been studied in natural abundances between 64 and 351 GHz. In combination with previous results, greatly improved spectroscopic parameters have been obtained which in turn helped to identify transitions of the $^{13}$C species for the first time in space through a molecular line survey of the extremely line-rich interstellar source Sagittarius B2(N) in the 3 mm region with some additional observations at 2 mm. The $^{13}$C species are detected in two compact ($\sim 2.3''$), hot (170 K) cores with a column density of $\sim 3.8 \times 10^{16}$ and $1.1 \times 10^{16}$ cm$^{-2}$, respectively. In the main source, the so-called ``Large Molecule Heimat'', we derive an abundance of $2.9 \times 10^{-9}$ for each $^{13}$C species relative to H$_2$. An isotopic ratio $^{12}$C/$^{13}$C of 21 has been measured. Based on a comparison to the column densities measured for the $^{13}$C species of ethyl cyanide also detected in this survey, it is suggested that the two hot cores of Sgr B2(N) are in different evolutionary stages. Supplementary laboratory data for the main isotopic species recorded between 92 and 342 GHz permitted an improvement of its spectroscopic parameters as well.
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