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arXiv 2005.04638physics.chem-ph
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强磁场中氦二聚体的成键:自旋和angular momentum的作用

Bonding in the helium dimer in strong magnetic fields: the role of spin and angular momentum

Jon Austad, Alex Borgoo, Erik I. Tellgren, Trygve Helgaker

摘要:

在全组态相互作用水平上,我们研究了强磁场中氦二聚体的电子能谱及其离解曲线。为了解决圆柱对称性和角动量的损失作为一个很好的量子数的键轴和磁场之间的非平凡的角度,我们引入了几乎量子化的角动量(AQAM),并表明它提供了有用的信息,在任意取向的状态。一般来说,强磁场会显著地重排光谱,随着磁场强度的增加,轨道塞曼效应会将具有较高角动量的态降到具有纯$σ$特征的态之下。此外,自旋塞曼效应将三重态推到最低单重态以下;特别是,一个原子单位的场足够强,可以将五重态推到三重态以下。在一般情况下,键轴和磁场之间的角度也连续调制程度的$σ$,$π$,和$δ$字符的债券和先前确定的垂直顺磁性键合机制被发现是常见的激发态。电子状态与首选的斜场取向的确定和合理化的永久和感应电子电流。

英文摘要:

We investigate the helium dimer in strong magnetic fields, focusing on the spectrum of low-lying electronic states and their dissociation curves, at the full configuration-interaction level of theory. To address the loss of cylindrical symmetry and angular momentum as a good quantum number for nontrivial angles between the bond axis and magnetic field, we introduce the almost quantized angular momentum (AQAM) and show that it provides useful information about states in arbitrary orientations. In general, strong magnetic fields dramatically rearrange the spectrum, with the orbital Zeeman effect bringing down states of higher angular momentum below the states with pure $σ$ character as the field strength increases. In addition, the spin Zeeman effect pushes triplet states below the lowest singlet; in particular, a field of one atomic unit is strong enough to push a quintet state below the triplets. In general, the angle between the bond axis and the magnetic field also continuously modulates the degree of $σ$, $π$, and $δ$ character of bonds and the previously identified perpendicular paramagnetic bonding mechanism is found to be common among excited states. Electronic states with preferred skew field orientations are identified and rationalized in terms of permanent and induced electronic currents.

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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