论文标题
TMC-1中HC5NH+的暂定检测
Tentative detection of HC5NH+ in TMC-1
论文作者
论文摘要
使用Yebes 40m射电望远镜，我们报告了与旋转常数B0 = 1295.81581 +/- 0.00026 MHz和旋转常数B0谐音相关的一系列七个线的检测，而失真常数D0 = 27.3 +/- 0.5 Hz与冷浓密的云云TMC-1。从头算的计算表明，最好的候选者是阳离子HC5NH+和NC4NH+。从基于质子亲和力和偶极矩的计算和观察到的旋转常数和其他参数之间的比较，我们得出的结论是，观察到的线的载体的最佳候选者是质子化的氰二乙烯阳离子HC5NH+。 TMC-1中得出的HC5N/HC5NH+比率为240，与HC3N/HC3NH+比率非常相似。在冷致密云中质子化分子的化学模型的框架中讨论了结果。
Using the Yebes 40m radio telescope, we report the detection of a series of seven lines harmonically related with a rotational constant B0=1295.81581 +/- 0.00026 MHz and a distortion constant D0=27.3 +/- 0.5 Hz towards the cold dense cloud TMC-1. Ab initio calculations indicate that the best possible candidates are the cations HC5NH+ and NC4NH+. From a comparison between calculated and observed rotational constants and other arguments based on proton affinities and dipole moments, we conclude that the best candidate for a carrier of the observed lines is the protonated cyanodiacetylene cation, HC5NH+. The HC5N/HC5NH+ ratio derived in TMC-1 is 240, which is very similar to the HC3N/HC3NH+ ratio. Results are discussed in the framework of a chemical model for protonated molecules in cold dense clouds.
