Long-range interactions for hydrogen: 6P-1S and 6P-2S systems

U. Jentschura, Chandra M. Adhikari

Research output: Contribution to journalArticle

2 Citations (Scopus)


The collisional shift of a transition constitutes an important systematic effect in highprecision spectroscopy. Accurate values for van der Waals interaction coefficients are required in order to evaluate the distance-dependent frequency shift. We here consider the interaction of excited hydrogen 6P atoms with metastable atoms (in the 2S state), in order to explore the influence of quasi-degenerate 2P and 6S states on the dipole-dipole interaction. The motivation for the calculation is given by planned high-precision measurements of the transition. Due to the presence of quasi-degenerate levels, one can use the non-retarded approximation for the interaction terms over wide distance ranges.

Original languageEnglish
Article number48
Issue number4
Publication statusPublished - Dec 1 2017


  • Hyperfine levels
  • Interatomic interactions
  • Long-range interactions
  • Matrix element
  • Quasi-degenerate states

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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