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Titan’s Ionic Species: Theoretical Treatment of N2H+ and Related Ions

机译:泰坦的离子物种:N2H +和相关离子的理论处理

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摘要

We use different ab initio methods to compute the three-dimensional potential energy surface (3D-PES) of the ground state of N2H+. This includes the standard coupled cluster, the complete active space self-consistent field, the internally contacted multi reference configuration interaction, and the newly developed CCSD(T)- F12 methods. For the description of H and N atoms, several basis sets are tested. Then, we incorporate the 3D-PES analytical representations into variational calculations of the rovibrational spectrum of N2H+(X1Σ+) up to 7200 cm-1 above the zero point vibrational energy. Our data show that the CCSD(T)-F12/aug-ccpVTZ approach represents a compromise for good description of the PES and computation cost. This technique is recommended for full dimensional PES generation of atmospheric and astrophysical relevant polyatomic systems. We applied this method to derive the rovibrational spectra of N2H+(X1Σ+) and of N2H++(X2Σ+). Finally, we discuss the existence of the N2H++(X2Σ+) in Titan’s atmosphere.
机译:我们使用不同的从头算方法来计算N2H +基态的三维势能面(3D-PES)。这包括标准耦合群集,完整的活动空间自洽字段,内部联系的多参考配置交互以及新开发的CCSD(T)-F12方法。为了描述H和N原子,测试了几个基集。然后,我们将3D-PES解析表示形式整合到N2H +(X1Σ+)的零振动能量以上7200 cm-1处的振动光谱的变分计算中。我们的数据表明,CCSD(T)-F12 / aug-ccpVTZ方法代表了对PES和计算成本的良好描述的折衷方案。建议将该技术用于大气和天体相关多原子系统的全尺寸PES生成。我们应用此方法导出了N2H +(X1Σ+)和N2H ++(X2Σ+)的振动谱。最后,我们讨论了泰坦大气中N2H ++(X2Σ+)的存在。

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