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High-precision laser-assisted absolute determination of x-ray diffraction angles.

K Kubicek1, J Braun, H Bruhns

  • 1Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany. kubicek@mpi-hd.mpg.de

The Review of Scientific Instruments
|February 4, 2012
PubMed
Summary
This summary is machine-generated.

This study presents an upgraded high-precision crystal x-ray spectroscopy technique for accurate absolute wavelength determination. The enhanced method achieves unprecedented 1.5 ppm accuracy, enabling precise benchmarking of atomic physics theories for He-like ions.

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Area of Science:

  • Atomic Physics
  • X-ray Spectroscopy
  • Quantum Electrodynamics (QED)

Background:

  • Accurate wavelength determination is crucial for testing fundamental theories in atomic physics.
  • Existing methods often rely on x-ray reference lines, limiting precision or applicability.
  • High-precision spectroscopy of He-like ions provides sensitive tests for QED effects.

Purpose of the Study:

  • To upgrade a novel technique for absolute wavelength determination in high-precision crystal x-ray spectroscopy.
  • To achieve unprecedented accuracy in absolute x-ray wavelength measurements.
  • To enable precise benchmarking of predicted binding energies for He-like ions, sensitive to second-order QED contributions.

Main Methods:

  • Combines visible laser beams with the Bond method for Bragg angle determination without x-ray reference lines.
  • Utilizes flat crystals for absolute x-ray wavelength measurements, effective even at low x-ray fluxes.
  • Employs an upgraded spectrometer capable of resolving minute x-ray line curvature for enhanced accuracy.

Main Results:

  • Achieved an unprecedented absolute wavelength accuracy of 1.5 parts per million (ppm).
  • Successfully applied the technique to the 1s2p(1)P(1) → 1s(2)(1)S(0) w-line in He-like argon.
  • The high precision is sensitive to second-order QED contributions, including two-electron screening and two-photon radiative diagrams.

Conclusions:

  • The upgraded technique offers a significant advancement in absolute x-ray wavelength determination.
  • This precision level allows for the first time to benchmark predicted binding energies for He-like ions against advanced QED calculations.
  • The method opens new avenues for high-precision atomic physics experiments and theoretical validation.