Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Pulsed Power - Laser-Beam Matter Interaction
K 4.3: Vortrag
Mittwoch, 7. März 2018, 14:45–15:00, MB HS
Influence of the system lengthscale in the Strong Field Photoelectron Energy Spectra — •Abraham Camacho Garibay1, Zhou Wang1, Hyunwook Park1, Ulf Saalmann2, Jan-Michael Rost2, and Louis DiMauro1 — 1The Ohio State University, Columbus, OH, USA — 2MPI-PKS, Dresden
Electrons emitted from atoms in the presence of a strong (IR) lasers are successfully explained by the Three-Step Model, which considers the parent atom to have no volume. This model describes the features of photoelectron spectra in terms of direct electrons driven by the field, or backscattered ones from binary collisions, with cutoff energies of 2 and 10 Up respectively. In previous experiments with rare gas clusters, the resemblance to the atomic case was not clear and a thermalization process was considered to be dominant. With current laser capabilities with tunnable wavelength, along with variable cluster sizes, we show (experimentally and numerically) that energetic electrons are produced by field driven backscattered electrons. More importantly, we have found that this cutoff energy is universally determined by the dimensionless scaled cluster radius Rcl/rw, naturally extending our understanding of the atomic case.