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Variational Vibrational States of Methanol (12D)
Journal of Chemical Theory and Computation ( IF 5.7 ) Pub Date : 2024-08-30 , DOI: 10.1021/acs.jctc.4c00647 Ayaki Sunaga 1 , Gustavo Avila 1 , Edit Mátyus 1
Journal of Chemical Theory and Computation ( IF 5.7 ) Pub Date : 2024-08-30 , DOI: 10.1021/acs.jctc.4c00647 Ayaki Sunaga 1 , Gustavo Avila 1 , Edit Mátyus 1
Affiliation
Full-dimensional (12D) vibrational states of the methanol molecule (CH3OH) have been computed using the GENIUSH-Smolyak approach and the potential energy surface from Qu and Bowman (2013). All vibrational energies are converged better than 0.5 cm–1 with respect to the basis and grid size up to the first overtone of the CO stretch, ca. 2000 cm–1 beyond the zero-point vibrational energy. About 70 torsion-vibration states are reported and assigned. The computed vibrational energies agree with the available experimental data within less than a few cm–1 in most cases, which confirms the good accuracy of the potential energy surface. The computations are carried out using curvilinear normal coordinates with the option of path-following coefficients, which minimize the coupling of the small- and large-amplitude motions. It is important to ensure tight numerical fulfillment of the C3v(M) molecular symmetry for every geometry and coefficient set used to define the curvilinear normal coordinates along the torsional coordinate to obtain a faithful description of degeneracy in this floppy system. The reported values may provide a computational reference for fundamental spectroscopy, astrochemistry, and for the search of the proton-to-electron mass ratio variation using the methanol molecule.
中文翻译:
甲醇的变分振动态 (12D)
使用 GENIUSH-Smolyak 方法以及 Qu 和 Bowman (2013) 的势能面计算了甲醇分子 (CH 3 OH) 的全维 (12D) 振动态。相对于基础和网格尺寸,所有振动能量的收敛性优于 0.5 cm –1,直至 CO 拉伸的第一个泛音,约 100%。超出零点振动能量 2000 cm –1 。报告并指定了大约 70 种扭转振动状态。大多数情况下,计算出的振动能与现有实验数据的吻合度小于几cm –1 ,这证实了势能面的良好准确性。使用带有路径跟踪系数选项的曲线法线坐标进行计算,这最大限度地减少了小幅度运动和大幅度运动的耦合。重要的是要确保用于定义沿扭转坐标的曲线法向坐标的每个几何形状和系数集严格数值满足C 3v (M) 分子对称性,以获得对该软盘系统中简并性的忠实描述。报告的值可以为基础光谱学、天体化学以及使用甲醇分子搜索质子与电子质量比变化提供计算参考。
更新日期:2024-08-30
中文翻译:
甲醇的变分振动态 (12D)
使用 GENIUSH-Smolyak 方法以及 Qu 和 Bowman (2013) 的势能面计算了甲醇分子 (CH 3 OH) 的全维 (12D) 振动态。相对于基础和网格尺寸,所有振动能量的收敛性优于 0.5 cm –1,直至 CO 拉伸的第一个泛音,约 100%。超出零点振动能量 2000 cm –1 。报告并指定了大约 70 种扭转振动状态。大多数情况下,计算出的振动能与现有实验数据的吻合度小于几cm –1 ,这证实了势能面的良好准确性。使用带有路径跟踪系数选项的曲线法线坐标进行计算,这最大限度地减少了小幅度运动和大幅度运动的耦合。重要的是要确保用于定义沿扭转坐标的曲线法向坐标的每个几何形状和系数集严格数值满足C 3v (M) 分子对称性,以获得对该软盘系统中简并性的忠实描述。报告的值可以为基础光谱学、天体化学以及使用甲醇分子搜索质子与电子质量比变化提供计算参考。