Determination of atomic multiphoton ionization phases by trichromatic
multichannel wave packet interferometry
- URL: http://arxiv.org/abs/2203.00323v2
- Date: Thu, 3 Mar 2022 12:03:30 GMT
- Title: Determination of atomic multiphoton ionization phases by trichromatic
multichannel wave packet interferometry
- Authors: K. Eickhoff, D. K\"ohnke, L. Feld, T. Bayer, M. Wollenhaupt
- Abstract summary: technique based on trichromatic pulse shaping for unambiguous determination of quantum phases in MPI of potassium atoms.
We show that ionization via a non-resonant intermediate state lifts the degeneracy of photoelectron interferograms from pathways consisting of permutations of the colors.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present a multichannel photoelectron interferometry technique based on
trichromatic pulse shaping for unambiguous determination of quantum phases in
multiphoton ionization (MPI) of potassium atoms. The colors of the laser field
are chosen to produce three energetically separated photoelectron
interferograms in the continuum. While the red pulse is two-photon resonant
with the $3d$-state resulting in a (2+1) resonance-enhanced MPI (REMPI), a
(1+2) REMPI occurs via the non-resonant intermediate $4p$-state with an initial
green or blue pulse. We show that ionization via a non-resonant intermediate
state lifts the degeneracy of photoelectron interferograms from pathways
consisting of permutations of the colors. The analysis of the interferograms
reveals a phase shift of $\pm \pi/2$ depending on the sign of the detunings in
the (1+2) REMPI pathways. In addition, we demonstrate that the photoionization
time delay in the resonant (2+1) REMPI pathway gives rise to a linear spectral
phase in the photoelectron spectra. Insights into the underlying MPI processes
are gained through an analytic perturbative description and numerical
simulations of a trichromatic driven three level system coupled to the
continuum.
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