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. 2020 Jan 31;7(1):014303. doi: 10.1063/1.5131216

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© 2020 Author(s).

2329-7778/2020/7(1)/014303/10

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FIG. 4. — Angle integrated photoemission spectra of polycrystalline gold foil at T = 40 K, with 16.9 eV photon energy (7th HHG harmonic, upper panel) and 21.7 eV photon energy (9th HHG harmonic, lower panel), changing the energy per pulse of the driving laser from 110 μJ to 19.9 μJ; for each spectrum, the total electron yield (I_sample) is reported as a measure of the total power impinging on the sample, with the correspondent total power impinging on the HHG gas nozzle. Spectra are rescaled so as to have the same height of the Fermi step.