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arXiv 2302.01414physics.chem-phquant-ph
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基于变分计算的HCOOH振动红外与拉曼光谱

Vibrational infrared and Raman spectrum of HCOOH from variational computations

Gustavo Avila, Alberto Martín Santa Daría, Edit Mátyus

AI总结:

本研究通过GENIUSH-Smolyak变分法结合从头算势能面,收敛了甲酸分子全部振动能级至4500 cm$^{-1}$,并基于CCSD/aug-cc-pVTZ拟合的偶极和极化率曲面,模拟了喷射冷却的红外与拉曼光谱,为振动实验和旋转振动计算提供了基准数据。

摘要:

利用GENIUSH-Smolyak变分方法,并采用从头算势能面[D. P. Tew和W. Mizukami, J. Phys. Chem. A, 120, 9815-9828 (2016)],甲酸分子的(反式、顺式、离域化)所有振动能级在零点振动能之上收敛至4500 cm$^{-1}$。在CCSD/aug-cc-pVTZ理论水平上计算的点上拟合了全维偶极矩和极化率曲面。然后,评估了体固定振动偶极矩和极化率跃迁矩,并用于模拟HCOOH的喷射冷却红外和拉曼光谱。基准质量的振动能、跃迁矩和波函数列表将在后续工作中用于与振动实验的比较,以及进一步的旋转振动计算。

英文摘要:

All vibrational energies of the (trans-, cis-, delocalized-) formic acid molecule are converged up to 4500 cm$^{-1}$ beyond the zero-point vibrational energy with the GENIUSH-Smolyak variational approach and using an ab initio potential energy surface [D. P. Tew and W. Mizukami, J. Phys. Chem. A, 120, 9815-9828 (2016)]. Full-dimensional dipole and polarizability surfaces are fitted to points computed at the CCSD/aug-cc-pVTZ level of theory. Then, body-fixed vibrational dipole and polarizability transition moments are evaluated and used to simulate jet-cooled infrared and Raman spectra of HCOOH. The benchmark-quality vibrational energy, transition moment, and wave function list will be used in further work in comparison with vibrational experiments, and in further rovibrational computations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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