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Circular Holographic Ionization-Phase Meter.

S Donsa1, N Douguet2, J Burgdörfer1

  • 1Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria, EU.

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|November 8, 2019
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Summary
This summary is machine-generated.

We developed a new attosecond pump-probe method to directly measure ionization phases. This technique, the circular holographic ionization-phase meter, reveals photoemission phase information from a single time-delay measurement.

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Area of Science:

  • Quantum physics
  • Attosecond science
  • Photoionization dynamics

Background:

  • Measuring electron ionization phases is crucial for understanding light-matter interactions.
  • Current methods often lack direct phase measurement capabilities or require complex setups.

Purpose of the Study:

  • To propose a novel attosecond extreme ultraviolet (XUV) pump IR-probe photoionization protocol.
  • To enable direct measurement of ionization phases with high precision.
  • To provide access to photoemission phase information of continuum states.

Main Methods:

  • Utilizing pairs of counterrotating consecutive harmonics in an XUV pump pulse.
  • Employing angularly resolved photoelectron detection.
  • Developing the circular holographic ionization-phase meter (CHIPM) technique.

Main Results:

  • Direct measurement of ionization phases is achieved.
  • Access to the phase of photoemission amplitudes of even-parity continuum states is demonstrated.
  • The method successfully reproduces rapid phase excursions in ab initio simulations of helium photoionization.

Conclusions:

  • The circular holographic ionization-phase meter offers a direct and efficient way to measure ionization phases.
  • This technique advances our understanding of electron dynamics in photoionization processes.
  • The method is validated through simulations, showing its potential for experimental application.