当前位置: X-MOL 学术Astrophys. J. Suppl. Ser. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The Synchrotron-based Far-infrared Spectrum of Glycolaldehyde
The Astrophysical Journal Supplement Series ( IF 8.7 ) Pub Date : 2021-03-18 , DOI: 10.3847/1538-4365/abde40
Breanna Collier 1 , Kristopher Krueger 1 , Isaac Miller 1 , Jianbao Zhao 2 , Brant E. Billinghurst 2 , Paul L. Raston 1, 3
Affiliation  

Glycolaldehyde (GA) has been observed toward several different sources, with a broad range of rotational temperatures (8–300 K). At the high end, the temperature is comparable to the energy of the lowest vibrational states of GA, making the vibrational contribution to the partition function significant. Here, we report an analysis of the high-resolution far-infrared spectrum of GA, which features a plethora of well-resolved lines from 170–430 cm−1 (13–5 THz). We focus on the three fundamental vibrational bands in this range, i.e., the symmetric ν 12 bend at 282 cm−1, and the asymmetric ν 17 and ν 18 torsions at 360 and 208 cm−1, respectively. We assigned 23,266 transitions to 13,999 lines within these bands, which, when combined with the previously reported microwave and millimeter-wave spectra, allowed for refinement of the vibrationally excited rotational constants, and accurate determination of their band origins. Additionally, the assignment of a number of lines in several hot bands that are significantly populated at 300 K allowed for determination of their band origins. The rotational constants reported here should be useful in searches of vibrationally excited GA toward warm sources, and the accurately determined band origins allow for refinement of the vibrational partition function, and therefore column density, for a given excitation temperature.



中文翻译:

基于同步加速器的乙醇醛远红外光谱

已观察到乙醇醛 (GA) 有多种不同来源,旋转温度范围很广(8-300 K)。在高端,温度与 GA 的最低振动状态的能量相当,使得对分配函数的振动贡献显着。在这里,我们报告了对 GA 的高分辨率远红外光谱的分析,该光谱具有从 170–430 cm -1 (13–5 THz) 范围内的大量解析良好的谱线。我们关注这个范围内的三个基本振动带,即在 282 cm -1处的对称ν 12弯曲,以及在 360 和 208 cm -1处的不对称ν 17ν 18扭转 , 分别。我们将 23,266 条跃迁分配给这些波段内的 13,999 条谱线,结合之前报道的微波和毫米波光谱,可以改进振动激发的旋转常数,并准确确定它们的波段起源。此外,在 300 K 显着填充的几个热波段中分配了许多线,可以确定它们的波段起源。此处报告的旋转常数应该有助于搜索向暖源振动激发的 GA,并且准确确定的带起源允许改进振动分配函数,从而改进给定激发温度的柱密度。

更新日期:2021-03-18
down
wechat
bug