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Two-color photoionization in xuv free-electron and visible laser fields

Meyer, M. and Cubaynes, D. and O’Keeffe, P. and Luna, H. and Yeates, Patrick and Kennedy, Eugene T. and Costello, John T. and Orr, P. and Taïeb, R. and Maquet, A. and Düsterer, S. and Radcliffe, P. and Redlin, H. and Azima, A. and Plönjes, E. and Feldhaus, J. (2006) Two-color photoionization in xuv free-electron and visible laser fields. Physical Review A, 74 (1). 011401-1. ISSN 1050-2947

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Two-photon ionization of atomic helium has been measured by combining femtosecond extreme-ultraviolet pulses from the free-electron laser in Hamburg (FLASH at DESY) with intense light pulses from a synchronized neodymium-doped yttrium lithium fluoride laser. Sidebands appear in the photoelectron spectra when the two laser pulses overlap in both space and time. Their intensity exhibits a characteristic dependence on the relative time delay between the ionizing and the dressing pulses and provides an inherent time marker for time-resolved pump-probe experiments. The measurements of the sidebands are in good agreement with theoretical predictions and allow for a direct analysis of two-photon ionization, free from processes related to interference between multiple quantum paths.

Item Type:Article (Published)
Subjects:Physical Sciences > Physics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:The American Physical Society
Official URL:
Copyright Information:© 2006 The American Physical Society
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Enterprise Ireland, Higher Education Authority, Science Foundation Ireland
ID Code:15604
Deposited On:05 Aug 2010 14:44 by DORAS Administrator. Last Modified 05 Aug 2010 14:44

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