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Sensitivity of nonlinear photoionization to resonance substructure in collective excitation

O'Keeffe, P.; Mazza, T.; Karamatskou, A.; Ilchen, M.; Bakhtiarzadeh, S.; Rafipoor, A. J.; O’Keeffe, P.; Kelly, T. J.; Walsh, N.; Costello, J. T.; Meyer, M.; Santra, R.; Mazza, Tommaso; Karamatskou, Antonia; Ilchen, Markus; Bakhtiarzadeh, Sadegh; Rafipoor, Amir Jones; O'Keeffe, Patrick; Kelly, Thomas J.; Walsh, Nichola; Costello, John T.; Meyer, Michael; Santra, Robin


T. Mazza

A. Karamatskou

M. Ilchen

S. Bakhtiarzadeh

A. J. Rafipoor

P. O’Keeffe

J. T. Costello

M. Meyer

R. Santra

P. O'Keeffe


Collective behaviour is a characteristic feature in many-body systems, important for developments in fields such as magnetism, superconductivity, photonics and electronics. Recently, there has been increasing interest in the optically nonlinear response of collective excitations. Here we demonstrate how the nonlinear interaction of a many-body system with intense XUV radiation can be used as an effective probe for characterizing otherwise unresolved features of its collective response. Resonant photoionization of atomic xenon was chosen as a case study. The excellent agreement between experiment and theory strongly supports the prediction that two distinct poles underlie the giant dipole resonance. Our results pave the way towards a deeper understanding of collective behaviour in atoms, molecules and solid-state systems using nonlinear spectroscopic techniques enabled by modern short-wavelength light sources.

Journal Article Type Article
Publication Date Apr 10, 2015
Journal Nature communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 6
Issue 1
Pages 6799-1-6799-6
Keywords Physical sciences, Atomic and molecular physics
Publisher URL
Copyright Statement This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Additional Information This is a copy of an open access article published in Nature communications, 2016, v.6.


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