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Attosecond transient absorption of a bound wave packet coupled to a smooth continuum
Stockholm University, Faculty of Science, Department of Physics. Lund University, Sweden.ORCID iD: 0000-0002-5274-1009
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0003-3444-1317
Number of Authors: 32017 (English)In: Journal of Optics, ISSN 2040-8978, E-ISSN 2040-8986, Vol. 19, no 11, article id 114004Article in journal (Refereed) Published
Abstract [en]

We investigate the possibility of using transient absorption of a coherent bound electron wave packet in hydrogen as an attosecond pulse characterization technique. In a recent work, we have shown that photoionization of such a coherent bound electron wave packet opens up for pulse characterization with unprecedented temporal accuracy-independent of the atomic structure-with maximal photoemission at all kinetic energies given a wave packet with zero relative phase (Pabst and Dahlstrom Phys. Rev. A 94 13411 (2016)). Here, we perform numerical propagation of the time-dependent Schrodinger equation and analytical calculations based on perturbation theory to show that the energy-resolved maximal absorption of photons from the attosecond pulse does not uniquely occur at a zero relative phase of the initial wave packet. Instead, maximal absorption occurs at different relative wave packet phases, distributed as a non-monotonous function with a smooth -pi/2 shift across the central photon energy (given a Fourier-limited Gaussian pulse). Similar results are also found in helium. Our finding is surprising, because it implies that the energy-resolved photoelectrons are not mapped one-to-one with the energy-resolved absorbed photons of the attosecond pulse.

Place, publisher, year, edition, pages
2017. Vol. 19, no 11, article id 114004
Keywords [en]
attosecond, transient absorption, ATAS, pulse characterization, continuum transition
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-148965DOI: 10.1088/2040-8986/aa8a93ISI: 000413318300001OAI: oai:DiVA.org:su-148965DiVA, id: diva2:1163575
Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-07Bibliographically approved

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