Concerning the asymmetric top rotational partition function in astronomical spectroscopy
Concerning the asymmetric top rotational partition function in astronomical spectroscopy
复制标题
关于天文光谱中的不对称顶部旋转配分函数
DOI:
10.1016/j.jms.2020.111292
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发表时间:
2020
影响因子:
1.4
通讯作者:
Raston, Paul L.
中科院分区:
文献类型:
--
作者:
Wells, Tyler;Raston, Paul L.
The partition function plays an important role in determining column densities from emission lines in molecular clouds, since under typical conditions the two are linearly related. Here, we focus on successively applying quantum and centrifugal distortion correction terms to the classical rotational partition function for asymmetric top molecules, in an effort to uncover the relative importance of each term. We do this for example asymmetric top molecules that contain from one to four heavy atoms (water, methanimine, vinyl alcohol, and glycolaldehyde), at temperatures relevant to interstellar molecular clouds. Particular attention is paid to methanimine, for which it was recently attested that the value of the classical partition function significantly differs from the numerically summed (exact) value at several hundred Kelvin [Sharmaet al., Astron. Nachrichten.338, 125 (2017)]. We show that the classical values are in fact within 1% of the exact values from ~50 K to well above 400 K; the addition of three simple correction terms reduces the error to ≲0.001% (down to 10 K).
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影响因子:
4.4
作者:
K. F. Stripp;J. Kirkwood
通讯作者:
J. Kirkwood
影响因子:
1.4
作者:
W. Murphy
通讯作者:
W. Murphy
DOI:
10.1017/s0305004100015796
发表时间:
1928
影响因子:
0.8
作者:
H. Mulholland
通讯作者:
H. Mulholland
DOI:
10.1086/181828
发表时间:
1974
期刊:
The Astrophysical Journal
影响因子:
--
作者:
H. Liszt;B. Turner
通讯作者:
B. Turner
影响因子:
--
作者:
H. W. Woolley
通讯作者:
H. W. Woolley