Journal
JOURNAL OF MODERN OPTICS
Volume 63, Issue 4, Pages 358-366Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2015.1117669
Keywords
Free electron laser; FLASH; laser-assisted photoelectric effect; sidebands; soft photon approximation; two colour experiments
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Funding
- EU RTD project X-ray FEL Pump-Probe [HRPI-CT-1999-50009]
- Science Foundation Ireland [12/IA/1742, 13/SIRG/2100]
- French-Ireland ULYSSES program
- Irish Research Council for Science, Engineering and Technology
- FP7-PEOPLE-2012-IRSES scheme [318941]
- [FP7] Erasmus Mundus Joint Doctorate EXTATIC [FPA-2012-0033]
- Science Foundation Ireland (SFI) [13/SIRG/2100] Funding Source: Science Foundation Ireland (SFI)
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In this paper, we report results on two-colour above-threshold ionisation, where extreme ultraviolet pulses of femtosecond duration were synchronised to intense infrared laser pulses of picosecond duration, in order to study the laser-assisted photoelectric effect of atomic helium, neon, krypton and xenon which leads to the appearance of characteristic sidebands in the photoelectron spectra. The observed trends are found to be well described by a simple model based on the soft-photon approximation, at least for the relatively low optical intensities of up to 5 x 10(11)Wcm(-2) employed in these early experiments.
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