Vacuum space charge effects in sub-picosecond soft X-ray photoemission on a 
molecular adsorbate layer

Dell'Angela, M.; Anniyev, T.; Beye, M.; Coffee, R.; Föhlisch, A.; Gladh, J.; Kaya, S.; Katayama, T.; Krupin, O.; Nilsson, A.; Nordlund, D.; Schlotter, W. F.; Sellberg, J. A.; Sorgenfrei, F.; Turner, J. J.; Öström, H.; Ogasawara, H.; Wolf, Martin; Wurth, W.

doi:10.1063/1.4914892

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Vacuum space charge effects in sub-picosecond soft X-ray photoemission on a molecular adsorbate layer

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Wolf, Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Dell'Angela, M., Anniyev, T., Beye, M., Coffee, R., Föhlisch, A., Gladh, J., et al. (2015). Vacuum space charge effects in sub-picosecond soft X-ray photoemission on a molecular adsorbate layer. Structural Dynamics, 2(2): 025101. doi:10.1063/1.4914892.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-7936-9

Abstract

Vacuum space charge induced kinetic energy shifts of O 1s and Ru 3d core levels in femtosecond soft X-ray photoemission spectra (PES) have been studied at a free electron laser (FEL) for an oxygen layer on Ru(0001). We fully reproduced the measurements by simulating the in-vacuum expansion of the photoelectrons and demonstrate the space charge contribution of the high-order harmonics in the FEL beam. Employing the same analysis for 400 nm pump-X-ray probe PES, we can disentangle the delay dependent Ru 3d energy shifts into effects induced by space charge and by lattice heating from the femtosecond pump pulse.