期刊
JOURNAL OF MOLECULAR SPECTROSCOPY
卷 342, 期 -, 页码 125-131出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jms.2017.07.008
关键词
Propanal; Rotational spectroscopy; Submillimeter wave spectroscopy; Interstellar molecule; Internal rotation; Tunneling rotation interaction
资金
- Collaborative Research Centre 956 - Deutsche Forschungsgemeinschaft (DFG)
- Geratezentrum Cologne Center for Terahertz Spectroscopy - Deutsche Forschungsgemeinschaft (DFG)
- Bonn-Cologne-Graduate School of Physics and Astronomy (BCGS)
- European Research Council (ERC) under European Union's Horizon research and innovation programme through ERC Consolidator Grant S4F [646908]
The rotational spectra of the two stable conformers syn- and gauche-propanal (CH3CH2CHO) 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. (C) 2017 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据