Probing the longitudinal momentum spread of the electron wave packet at the tunnel exit
1 Physics Department, ETH Zurich, CH-8093 Zurich, Switzerland
2 Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
We present an ellipticity resolved study of momentum distribution arising from strong-field ionization of helium. The influence of the ion potential on the departing electron is considered within a semi-classical model consisting of an initial tunneling step and subsequent classical propagation. We find that the momentum distribution can be explained by including the longitudinal momentum spread of the electron at the exit from the tunnel. Our combined experimental and theoretical study provides an estimate of this momentum spread.
© Owned by the authors, published by EDP Sciences, 2013
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