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A laboratory heterodyne emission spectrometer at submillimeter wavelengths
Physical Chemistry Chemical Physics ( IF 3.3 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7cp06394f
N. Wehres 1, 2, 3, 4 , J. Maßen 1, 2, 3, 4 , K. Borisov 1, 2, 3, 4 , B. Schmidt 1, 2, 3, 4 , F. Lewen 1, 2, 3, 4 , U. U. Graf 1, 2, 3, 4 , C. E. Honingh 1, 2, 3, 4 , D. R. Higgins 1, 2, 3, 4 , S. Schlemmer 1, 2, 3, 4
Affiliation  

We present first results on a newly built broadband emission spectrometer for the laboratory making use of a double sideband (DSB) heterodyne receiver. The new spectrometer is perfectly suited for high-resolution emission spectroscopy of molecules of astrophysical importance. The current SIS receiver operates at RF frequencies between 270 and 390 GHz, coincident with Band 7 of the ALMA telescope. The instantaneous bandwidth is 5 GHz (DSB). In this work the full spectrometer and its components are described. Its performance, in particular its sensitivity, stability, reproducibility and systematic errors, is characterized in detail. For this purpose very broad band emission spectra of methyl cyanide have been recorded and compared to theoretical spectra. Isotopic variants are found in natural abundance and features attributed to vibrationally excited species are all recorded in the same spectrum. The performance of the new spectrometer is compared extensively to that of a traditional FM-absorption spectrometer and to recent versions of chirped-pulse spectrometers operated in the mm-wave regime. Further applications and future advancements of the current instrument are discussed.

中文翻译:

亚毫米波长的实验室外差发射光谱仪

我们介绍了在实验室中使用双边带(DSB)外差接收器的新型宽带发射光谱仪上的第一个结果。新型光谱仪非常适合天体重要性分子的高分辨率发射光谱。当前的SIS接收器在270至390 GHz的RF频率下工作,与ALMA望远镜的7频段一致。瞬时带宽为5 GHz(DSB)。在这项工作中,将描述完整的光谱仪及其组件。详细描述了它的性能,特别是它的灵敏度,稳定性,可重复性和系统误差。为此,已记录了甲基氰化物的很宽带发射光谱,并将其与理论光谱进行了比较。同位素变体以自然丰度存在,归因于振动激发物种的特征都记录在同一光谱中。新型光谱仪的性能与传统的FM吸收光谱仪以及在毫米波模式下运行的recent脉冲光谱仪的最新版本进行了广泛的比较。讨论了当前仪器的进一步应用和未来发展。
更新日期:2017-11-23
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