Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.083002
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Funding
- NCCR Quantum Photonics (NCCR QP)
- NCCR Molecular Ultrafast Science and Technology (NCCR MUST)
- Swiss National Science Foundation (SNSF)
- ETH [ETH-03 09-2]
- SNSF
- Danish Research Council [10-085430]
- ERC-StG [277767-TDMET]
- FP7 IIF [275313]
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We present an ellipticity-resolved study of momentum distributions arising from strong-field ionization of helium. The influence of the ion potential on the departing electron is considered within a semiclassical 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.
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