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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Linear carbon chains of type SiCnO (n=3-8): Results of coupled cluster calculations
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Linear carbon chains of type SiCnO (n=3-8): Results of coupled cluster calculations

机译:SiCnO型线性碳链(n = 3-8):耦合簇计算的结果

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On the basis of (R)CCSD(T) calculations with the cc-pVQZ basis set, accurate equilibrium bond lengths (ca. 0.0005 angstrom accuracy) are established for linear carbon chains of type SiCnO with n = 3-8. SiC and CO equilibrium bond lengths are in the range 1.683-1.735 and 1.165-1.167 angstrom, respectively. A narrow range (1.272-1.287 angstrom) is obtained for all 25 carbon-carbon equilibrium distances. The equilibrium dipole moments (mu(e)) exhibit large correlation effects. The mu(e) values for the closed-shell species with even integer n are larger than those for the triplet ground states of SiCnO chains with odd n values. Various spectroscopic constants such as harmonic vibrational wavenumbers, vibration -rotation coupling, and 1-type doubling constants are calculated. The ground-state rotational constants of SiC3O, SiC4O, and SiC5O are predicted with ca. 0.1% accuracy to be 1386.5, 867.0, and 564.4 MHz.
机译:在使用cc-pVQZ基集进行(R)CCSD(T)计算的基础上,建立了n = 3-8的SiCnO型线性碳链的准确平衡键长度(约0.0005埃精度)。 SiC和CO平衡键的长度分别在1.683-1.735和1.165-1.167埃之间。对于所有25个碳-碳平衡距离,都获得了一个窄范围(1.272-1.287埃)。平衡偶极矩(mu(e))表现出较大的相关效应。具有偶数整数n的闭壳物种的mu(e)值大于具有奇数n值的SiCnO链的三重态基态的mu(e)值。计算各种光谱常数,例如谐波振动波数,振动-旋转耦合和1型倍增常数。预测SiC3O,SiC4O和SiC5O的基态旋转常数约为ca。 0.1%的精度为1386.5、867.0和564.4 MHz。

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