The experimental arrangement consisted of a Nd:YAG pumped pulsed dye laser which was focused and crossed at right angle with a cesium beam. Photoelectrons were energy-analyzed by a spherical sector energy analyzer and detected with a dual multichannel plate.

Topical Meeting on Laser Techniques in the Extreme UltravioletJan 1, 19840 citations

Springer eBooks

A Contribution Towards the Theory of Multichannel Multiphoton Ionization of Atoms

R. Burlon, Claudio Leone, G. Ferrante

Published Jan 1, 1988• 0 citations

Publisher

DOI: 10.1007/978-1-4613-0967-3_35

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3d

state resulting in a

(2+1)

resonance-enhanced MPI (REMPI), a

(1+2)

REMPI occurs via the nonresonant intermediate

4p

state with an initial green or blue pulse. We show that ionization via a nonresonant 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 $\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2$ 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.