Calculated Dipole Moments for Silicon and Phosphorus Compounds of Astrophysical Interest

被引:32
|
作者
Mueller, Holger S. P. [1 ]
Woon, David E. [2 ]
机构
[1] Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany
[2] Univ Illinois, Dept Chem, Urbana, IL 61801 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY A | 2013年 / 117卷 / 50期
关键词
CORRELATED MOLECULAR CALCULATIONS; GAUSSIAN-BASIS SETS; COUPLED-CLUSTER SINGLES; CONSISTENT BASIS-SETS; MICROWAVE-SPECTRUM; PHOTOELECTRON-SPECTROSCOPY; ASTRONOMICAL DETECTION; ROTATIONAL SPECTRUM; COLOGNE DATABASE; INTERSTELLAR PN;
D O I
10.1021/jp4083807
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Dipole moments, which contribute to the intensities of rotational transitions and also affect reactivity, have been computed for nearly 80 compounds with up to 6 atoms containing silicon or phosphorus. More than a dozen of the set have been detected in these, and several of them may be found in space in the future. We compare results from the commonly used B3LYP level of density functional theory with ab initio results at the coupled cluster CCSD(T)/RCCSD(T) levels of theory. Correlation consistent basis sets as large as quintuple zeta quality were used, and extrapolations to the estimated complete basis set (CBSE) limit were performed for almost all of the species with coupled cluster theory. In addition to evaluating the accuracy of the results against available data, we explore various issues: the critical importance of including diffuse basis functions, the range of basis set dependence exhibited by the suite of molecules, and the presence of low-lying excited states for some species. Dipole polarizabilities are also reported at the CCSD(T)/RCCSD(T) CBSE level.
引用
收藏
页码:13868 / 13877
页数:10
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