Pressure shifts in high-precision hydrogen spectroscopy. I. Long-range atom–atom and atom–molecule interactions
Pressure shifts in high-precision hydrogen spectroscopy. I. Long-range atom–atom and atom–molecule interactions
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高精度氢谱中的压力变化 I 长程原子与原子分子相互作用
DOI：
10.1088/1361-6455/ab08cc-1
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
N. Kolachevsky
中科院分区：
文献类型：
--
作者：
U. D. Jentschura;C. M. Adhikari;R. Dawes;A. Matveev;N. Kolachevsky
我们研究了高精度氢原子束光谱中压力漂移的理论基础，特别强调了涉及高激发P态的跃迁。特别研究了4P激发态氢原子与基态氢原子和亚稳态氢原子的长程相互作用，得到了超精细结构的全分辨。结果表明，为了得到可靠的理论预测，完全包含4p 1/2和4p 3/2流形是必要的，因为1s基态超精细频率与4p精细结构分裂是相称的。在4P-2S相互作用中遇到了一个更复杂的问题，考虑到范德华哈密顿量引起的偶极耦合，必须包含准简并的4S-2P 1/2态。尽管所有努力将问题归结为准退化基内的不可约子流形，但仍必须处理维度高达40的矩阵。我们主要研究了具有重要唯象意义的二阶范德华位移，它与1/R6成正比，其中R是原子间的距离，并得到了超精细结构的全分辨结果。由于能量的准简并，涉及激发P态的氢原子-原子碰撞的范德华系数的大小显著提高；对于涉及原子NP态的原子-分子碰撞，我们发现没有这样的增强，即使涉及振动能级的复杂分子光谱需要更深入的分析。
We study the theoretical foundations for the pressure shifts in high-precision atomic beam spectrosopy of hydrogen, with a particular emphasis on transitions involving higher excited P states. In particular, the long-range interaction of an excited hydrogen atom in a 4P state with a ground-state and metastable hydrogen atom is studied, with a full resolution of the hyperfine structure. It is found that the full inclusion of the 4P 1/2 and 4P 3/2 manifolds becomes necessary in order to obtain reliable theoretical predictions, because the 1S ground state hyperfine frequency is commensurate with the 4P fine-structure splitting. An even more complex problem is encountered in the case of the 4P–2S interaction, where the inclusion of quasi-degenerate 4S–2P 1/2 state becomes necessary in view of the dipole couplings induced by the van der Waals Hamiltonian. Matrices of dimension up to 40 have to be treated despite all efforts to reduce the problem to irreducible submanifolds within the quasi-degenerate basis. We focus on the phenomenologically important second-order van der Waals shifts, proportional to 1/R 6 where R is the interatomic distance, and obtain results with full resolution of the hyperfine structure. The magnitude of van der Waals coefficients for hydrogen atom–atom collisions involving excited P states is drastically enhanced due to energetic quasi-degeneracy; we find no such enhancement for atom–molecule collisions involving atomic nP states, even if the complex molecular spectrum involving ro-vibrational levels requires a deeper analysis.
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激发态氢原子的长程相互作用。
影响因子：
2.9
作者：
U. Jentschura;V. Debierre;C. Adhikari;A. Matveev;N. Kolachevsky
通讯作者：
N. Kolachevsky
影响因子：
1.8
作者：
U. Jentschura;C. Adhikari
通讯作者：
U. Jentschura;C. Adhikari
DOI：
10.1016/0167-5087(82)90385-4
发表时间：
1982
期刊：
Nuclear Instruments and Methods in Physics Research
影响因子：
--
作者：
B. Curnutte;C. Cocke;R. Dubois
通讯作者：
R. Dubois
LCAO MO 理论在 H2 中的应用
影响因子：
3
作者：
M. J. S. Dewar;J. Kelemen
通讯作者：
J. Kelemen
影响因子：
33.3
作者：
T. Lyman
通讯作者：
T. Lyman