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Novel phenomena in very-low-frequency strong fields.

¹Max Born Institute, 12489 Berlin, Germany.

Physical Review Letters

|April 28, 2009

Summary

This summary is machine-generated.

Atomic ionization by very low-frequency lasers shows unique spectral features, not a classical tunneling limit. Atom identity controls photoelectron spectra, revealing persistent peaks and valleys across field parameters.

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Area of Science:

Atomic physics
Laser-matter interactions
Quantum mechanics

Background:

Atomic ionization by lasers is typically described by tunneling ionization models.
Very low-frequency lasers were thought to represent a classical or tunneling limit.
Unique spectral features challenge existing theoretical frameworks.

Purpose of the Study:

To investigate the spectral characteristics of atomic ionization by very low-frequency lasers.
To determine if these features align with classical or tunneling ionization theories.
To explore the role of atomic identity in low-frequency laser ionization.

Main Methods:

Experimental observation of photoelectron spectra from atomic ionization.
Utilizing very low-frequency lasers (e.g., 10.6 micrometers).
Analysis of spectral features across varying laser field parameters.

Main Results:

Observed photoelectron spectra exhibit well-defined peaks and valleys.
These spectral features are distinct from typical tunneling ionization phenomena.
The observed structure persists over a wide range of laser field parameters.
The atomic identity was identified as the controlling factor for spectral features.

Conclusions:

Very low-frequency laser ionization presents unique spectral signatures, distinct from tunneling ionization.
The atom's identity is crucial in determining the resulting photoelectron spectrum.
These findings necessitate a re-evaluation of current models for atomic ionization in this regime.