AI Article Synopsis
- The interaction of a weak second-harmonic field with an intense laser during ionization affects the electron yield based on the phase relationship between the two frequency components.
- The proposed method, called "phase-of-the-phase spectroscopy," measures two key aspects: relative-phase contrast (RPC) and phase of the phase (PP) for each electron's momentum.
- Experimental results from rare gas atoms and CO₂ show a universal structure in the spectra, which, when analyzed with a model of electron dynamics, reveals target-sensitive details that can provide highly accurate structural and dynamical information.
Article Abstract
The presence of a weak second-harmonic field in an intense-laser ionization experiment affects the momentum-resolved electron yield, depending on the relative phase between the ω and the 2ω component. The proposed two-color "phase-of-the-phase spectroscopy" quantifies for each final electron momentum a relative-phase contrast (RPC) and a phase of the phase (PP) describing how much and with which phase lag, respectively, the yield changes as a function of the relative phase. Experimental results for RPC and PP spectra for rare gas atoms and CO_{2} are presented. The spectra demonstrate a rather universal structure that is analyzed with the help of a simple model based on electron trajectories, wave-packet spreading, and (multiple) rescattering. Details in the PP and RPC spectra are target sensitive and, thus, may be used to extract structural (or even dynamical) information with high accuracy.
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| http://dx.doi.org/10.1103/PhysRevLett.115.043001 | DOI Listing |
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