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arXiv · 1508.00760

Attosecond photoionization dynamics with stimulated core-valence transitions

Jhih-An You·Nina Rohringer·Jan Marcus Dahlström
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Abstract

We investigate ionization of neon atoms by an isolated attosecond pump pulse in the presence of two coherent extreme ultraviolet or x-ray probe fields. The probe fields are tuned to a core-valence transition in the residual ion and induce spectral shearing of the photoelectron distributions. We show that the photoelectron-ion coincidence signal contains an interference pattern that depends on the temporal structure of the attosecond pump pulse and the stimulated core-valence transition. Many-body perturbation theory is used to compute "atomic response times" for the processes and we find strikingly different behavior for stimulation to the outer-core hole (2p - 2s) and stimulation to the inner-core hole (2p - 1s). The response time of the inner-core transition is found to be comparable to that of state-of-the-art laser-based characterization techniques for attosecond pulses.

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Jhih-An You, Nina Rohringer, Jan Marcus Dahlström. 2016-02-25. Attosecond photoionization dynamics with stimulated core-valence transitions. https://doi.org/10.1103/physreva.93.033413

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