Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 46, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/46/12/125601
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Funding
- NCCR Quantum Photonics (NCCR QP)
- NCCR Molecular Ultrafast Science and Technology (NCCR MUST)
- ETH [ETH-03 09-2]
- SNSF
- Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme [275313]
- ETH Femtosecond and Attosecond Science and Technology (ETH-FAST) initiative as part of the NCCR MUST program
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We introduce a method to investigate the longitudinal momentum spread resulting from strong-field tunnel ionization of helium which, unlike other methods, is valid for all ellipticities of laser pulse. Semiclassical models consisting of tunnel ionization followed by classical propagation in the combined ion and laser field reproduce the experimental results if an initial longitudinal spread at the tunnel exit is included. The values for this spread are found to be of the order of twice the transverse momentum spread.
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