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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Strong field ionization rate for arbitrary laser frequencies.

S V Popruzhenko1, V D Mur, V S Popov

  • 1Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany.

Physical Review Letters
|December 31, 2008
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Summary

A new formula simplifies calculating ionization rates for atoms and ions in intense light fields. This analytical approach is validated by numerical simulations and applicable to free electron laser experiments.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Laser Physics

Background:

  • Intense electromagnetic fields can ionize atoms and ions.
  • Accurate calculation of ionization rates is crucial for understanding matter-field interactions.
  • Existing models may have limitations under certain conditions, particularly with new light sources.

Purpose of the Study:

  • To derive a simple, analytical formula for nonrelativistic ionization rates.
  • To provide a formula valid for all Keldysh parameter regimes.
  • To offer a tool relevant for experiments using advanced light sources like free electron lasers.

Main Methods:

  • Derivation of an analytical, nonrelativistic ionization rate formula.
  • Validation using ab initio numerical solutions of the time-dependent Schrödinger equation.
  • Assessment of formula validity across arbitrary Keldysh parameter values.

Main Results:

  • A simple, analytical formula for atomic and ionic ionization rates in intense UV and X-ray fields.
  • Confirmation of the formula's accuracy against complex numerical simulations.
  • Demonstrated applicability across a wide range of Keldysh parameters.

Conclusions:

  • The derived formula offers a computationally efficient and accurate method for predicting ionization rates.
  • This work provides a valuable tool for theoretical and experimental atomic physics.
  • The formula is particularly suited for interpreting results from cutting-edge free electron laser experiments.