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Figure 2
Photoelectron spectra at a FEL photon energy of 40.8 eV. The NIR intensities are (a) 1.6 × 1012 W cm−2, (b) 4.0 × 1012 W cm−2 and (c) 8.0 × 1013 W cm−2. SBn in the figure denotes the nth sideband peak. |
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Figure 2
Photoelectron spectra at a FEL photon energy of 40.8 eV. The NIR intensities are (a) 1.6 × 1012 W cm−2, (b) 4.0 × 1012 W cm−2 and (c) 8.0 × 1013 W cm−2. SBn in the figure denotes the nth sideband peak. |