2009/05/19 by Krzysztof Pachucki, K. Pachucki, V. A. Yerokhin · 1 citation
Materials Science · Physics and Astronomy · #Atomic and Molecular Physics #Fusion materials and technologies #Quantum, superfluid, helium dynamics #physics.atom-ph
paper · pdf · doi:10.1103/physreva.79.062516
published as Phys. Rev. A 79, 062516 (2009); Phys. Rev. A 80, 019902(E) (2009) · 19 pages
arxiv created 2009/05/19 · openalex publication_date 2009/06/30 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In order to explain discrepancies between theoretical predictions and experimental data for the helium fine structure, we check and recalculate all theoretical contributions up to orders m\ensuremathα7 and m2/M\ensuremathα6. The previous result for the m\ensuremathα7 correction is improved by a more accurate calculation of relativistic corrections to the Bethe logarithm. The theoretical values of the 2 3P0\ensuremath-2 3P1 and 2 3P1\ensuremath-2 3P2 fine-structure intervals in helium are, correspondingly, \ensuremathν01=29 616 946.2(1.6) kHz and \ensuremathν12=2 291 177.3(1.6) kHz, with the uncertainties being due to higher-order effects. For the small interval \ensuremathν12, the theoretical value agrees with the experimental data, whereas for the large interval \ensuremathν01, a discrepancy of about three standard deviations is present.