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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Note: Multi channel Doppler tuned spectrometer to study highly charged ions.

Ranjeet K Karn1, C N Mishra2, Nissar Ahmad3

  • 1Department of Physics, Jam. Co-operative College, Jamshedpur - 831036, India.

The Review of Scientific Instruments
|July 3, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel spectrometer to study highly charged ions. This setup precisely measured M1 and M2 transitions in He-like and Li-like iron, determining upper-level lifetimes.

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Area of Science:

  • Atomic Physics
  • Spectroscopy
  • Plasma Physics

Background:

  • Highly charged ions (HCIs) are crucial in astrophysics and fusion research.
  • Precise spectroscopic measurements of HCIs are essential for testing fundamental theories.
  • Existing methods often lack the resolution or directness needed for certain transitions.

Purpose of the Study:

  • To design and implement a multi-channel Doppler-tuned spectrometer for high-resolution study of HCIs.
  • To directly measure X-ray transitions and determine upper-level lifetimes of HCIs with high precision.
  • To resolve closely spaced spectral lines, including M1 and M2 transitions.

Main Methods:

  • Utilized a novel Soller slit assembly for angular dispersion of X-rays.
  • Employed a long one-dimensional position-sensitive proportional counter for detection.
  • Implemented a Doppler-tuned spectrometer setup for multi-channel analysis.
  • Studied transitions in Helium-like (He-like) and Lithium-like (Li-like) iron (Fe).

Main Results:

  • Successfully resolved the 1s2s (3)S1 - 1s(2) (1)S0 M1 transition in He-like Fe from its satellite line.
  • Resolved the 1s2s2p ⁴P(5/2)⁰ - 1s(2)2s (2)S(1/2) M2 transition in Li-like Fe.
  • Measured the lifetimes of the upper levels for these transitions with high precision.

Conclusions:

  • The developed spectrometer provides a direct and high-resolution method for studying HCI physics.
  • The precise measurements validate theoretical predictions and enhance our understanding of atomic structure.
  • This technique opens new avenues for spectroscopic investigations of complex atomic systems.