Hydrogenic Lamb shift in iron Fe25+ and fine-structure Lamb shift

C. T. Chantler, J. M. Laming, D. D. Dietrich, W. A. Hallett, R. McDonald, and J. D. Silver
Phys. Rev. A 76, 042116 – Published 18 October 2007

Abstract

1s2p Lyman α transitions in hydrogenic iron Fe25+ have been observed from a beam-foil source in fourth-order diffraction off ADP 101 and PET 002 crystals, simultaneously with the n=2 to n=4 Balmer β transitions diffracted in first order. Calibration of the local dispersion relation of the spectrometer using Balmer β lines provides measurements of Lyman α wavelengths. The approach of fitting the full two-dimensional dispersion relation, including other members of Balmer and Lyman series, limits random and systematic correlation of parameters, and reveals a major systematic due to dynamical diffraction depth penetration into a curved crystal. The development of a theory of x-ray diffraction from mosaic crystals was necessary for the accurate interpretation of the experimental data. Photographic theory was also developed in the process of this research. Several systematics are discussed and quantified for the first time for these medium-Z QED comparisons. 2s1s and 4f2p satellites are explicitly investigated, and a dominant systematic is uncovered, which is due to the variable location of spectral emission downstream of the beam-foil target. 1s2p32, 1s2p12 iron Lamb shifts are measured to be 35376±1900cm1 and 35953±1800cm1. These agree with but lie higher than theory. This represents a 5.7% measurement of the hydrogenic 1s2p12 Lamb shift in iron. The technique also reports the iron 2p322p12 fine structure as 171108cm1±180cm1, which represents a 51% measurement of the hydrogenic iron fine-structure Lamb shift, and reports measurements of secondary lines.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
2 More
  • Received 22 April 2007

DOI:https://doi.org/10.1103/PhysRevA.76.042116

©2007 American Physical Society

Authors & Affiliations

C. T. Chantler*

  • School of Physics, University of Melbourne, Victoria 3010, Australia

J. M. Laming

  • Space Science Division, Code 7674L, Naval Research Laboratory, Washington, D.C. 20375, USA

D. D. Dietrich

  • Lawrence Livermore National Laboratory, California 94550, USA

W. A. Hallett

  • GSK Clinical Imaging Centre, Imperial College, Hammersmith Hospital, London, United Kingdom

R. McDonald

  • MS 72-150, Lawrence Berkeley National Laboratory, Berkeley, California 94270, USA

J. D. Silver

  • University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

  • *chantler@physics.unimelb.edu.au

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 76, Iss. 4 — October 2007

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×