Absolute wavelength measurement and fine structure determination in /sup 7/Li II

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The energy levels of two-electron atoms continue to provide rigorous tests of relativistic quantum theory, and of correlation effects within a multi-particle system. These interactions are determined perturbatively, with several approximations, and theoretical results often differ. It is critical to provide precise measurements of absolute wavelengths connecting these atomic energy levels to obtain a resolution of the precision of the different parts of such complex calculations. In this work, we report a high precision optical measurements in the 1s2s /sup 3/S - 1s2p /sup 3/P multiplet of Li II using fast-beam laser spectroscopy. A collinear interaction using both parallel and ... continued below

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Pages: 3

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Riis, E.; Berry, H.G.; Poulsen, O.; Lee, S.A. & Tang, S.Y. January 1, 1985.

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The energy levels of two-electron atoms continue to provide rigorous tests of relativistic quantum theory, and of correlation effects within a multi-particle system. These interactions are determined perturbatively, with several approximations, and theoretical results often differ. It is critical to provide precise measurements of absolute wavelengths connecting these atomic energy levels to obtain a resolution of the precision of the different parts of such complex calculations. In this work, we report a high precision optical measurements in the 1s2s /sup 3/S - 1s2p /sup 3/P multiplet of Li II using fast-beam laser spectroscopy. A collinear interaction using both parallel and antiparallel laser and ion beams allows both for precise elimination of large Doppler shifts, and for a strong kinematic narrowing of the observed resonances, as compared with thermal beam experiments. The wavelengths of the observed resonance fluorescence radiation are determined by comparing them with simultaneously recorded saturated absorption profiles of molecular iodine hyperfine components. In turn, the absolute wavelengths of the iodine lines are obtained from precisely calibrated Fabry-Perot etalon fringes in a separate experiment. The final precision of the Li II wavelengths is 5 parts in 10/sup 9/, which is at a level of precision of 80 ppM of the QED corrections in the transition. 3 refs., 1 figs., 1 tab.

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Pages: 3

Notes

NTIS, PC A02/MF A01.

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  • 7. international conference on laser spectroscopy, Maui, HI, USA, 24 Jun 1985

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  • Other: DE85018382
  • Report No.: CONF-850605-5
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5222883
  • Archival Resource Key: ark:/67531/metadc1067116

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1985

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 20, 2018, 8:22 p.m.

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Riis, E.; Berry, H.G.; Poulsen, O.; Lee, S.A. & Tang, S.Y. Absolute wavelength measurement and fine structure determination in /sup 7/Li II, article, January 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc1067116/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.