arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.02148astro-ph.SRphysics.atm-clusphysics.chem-ph
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丙醛的毫米波和亚毫米波光谱

Millimeter and Submillimeter Wave Spectroscopy of Propanal

Oliver Zingsheim, Holger S. P. Müller, Frank Lewen, Jes K. Jørgensen, Stephan Schlemmer

摘要:

用科隆(亚)毫米波光谱仪在75 ~ 500 GHz的毫米波和亚毫米波范围内研究了顺式丙醛(CH $_3$ CH $_2$ CHO)的转动光谱。此外,与醛扭转和甲基扭转,分别与$syn$ -构象的第一激发态进行了分析。新获得的光谱参数产生更好的预测,从而满足新的天文观测的灵敏度和分辨率的要求,以明确地分配纯旋转过渡的丙醛。这一点在阿塔卡马大型毫米/亚毫米阵列原恒星干涉测线巡天(ALMA-PILS)的射电天文频谱上得到了证明。特别是,一个准确的描述所观察到的分裂,所造成的内部旋转的甲基在$syn$构象和隧道旋转相互作用从两个稳定的简并$gauche$构象,报告。丙醛的转动光谱是额外的兴趣,因为它的两个大幅度的运动有关的甲基和醛基,分别。

英文摘要:

The rotational spectra of the two stable conformers syn- and gauche-propanal (CH$_3$CH$_2$CHO) were studied in the millimeter and submillimeter wave regions from 75 to 500 GHz with the Cologne (Sub-)Millimeter wave Spectrometer. Furthermore, the first excited states associated with the aldehyde torsion and with the methyl torsion, respectively, of the $syn$-conformer were analyzed. The newly obtained spectroscopic parameters yield better predictions, thus fulfill sensitivity and resolution requirements in new astronomical observations in order to unambiguously assign pure rotational transitions of propanal. This is demonstrated on a radio astronomical spectrum from the Atacama Large Millimeter/submillimeter Array Protostellar Interferometric Line Survey (ALMA-PILS). In particular, an accurate description of observed splittings, caused by internal rotation of the methyl group in the $syn$-conformer and by tunneling rotation interaction from two stable degenerate $gauche$-conformers, is reported. The rotational spectrum of propanal is of additional interest because of its two large amplitude motions pertaining to the methyl and the aldehyde group, respectively.

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