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Spin and Angular Momentum in Strong-Field Ionization.

D Trabert1, A Hartung1, S Eckart1

  • 1Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany.

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|February 14, 2018
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Summary
This summary is machine-generated.

Multiphoton ionization of Xenon (Xe) reveals opposite electron spin polarizations for different ionic states. Spin polarization magnitude is higher for excited states, depending on magnetic quantum number.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Laser-Matter Interactions

Background:

  • Multiphoton ionization is a fundamental process in atomic physics.
  • Electron spin polarization is a key property influencing quantum phenomena.
  • Xenon (Xe) is a noble gas with complex electronic structure.

Purpose of the Study:

  • To measure the spin polarization of electrons emitted during Xe multiphoton ionization.
  • To investigate the influence of ionic states on electron spin polarization.
  • To explore the dependence of ionization probability on magnetic quantum number.

Main Methods:

  • Utilized 395 nm circularly polarized laser pulses at high intensity (6×10^13 W/cm²).
  • Analyzed electron energy distribution to resolve above-threshold ionization peaks.
  • Measured spin polarization of emitted electrons for distinct ionic states.

Main Results:

  • Observed clearly separated above-threshold ionization peaks for Xe+ ground (J=3/2) and excited (J=1/2) states.
  • Demonstrated opposite spin polarizations for electrons ionizing to different ionic states.
  • Found spin polarization magnitude to be twice as high for the J=1/2 state compared to the J=3/2 state.

Conclusions:

  • Electron spin polarization in multiphoton ionization is sensitive to the final ionic state.
  • Ionization probability is strongly dependent on the magnetic quantum number's sign.
  • This study provides insights into spin-dependent electron dynamics in atomic ionization.