| Conclusion |
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| • | Subpeaks
in ATI spectra from short pulses |
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| • | Explained
structures in 2D momentum distribution |
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| • | Dip
in parallel momentum: |
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| -Tunneling
regime: ATI peaks |
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| -Multiphoton
regime: Parity of first ATI peak |
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| -Coulomb
effect not relevant |
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| -Longer
pulses: Freeman resonances |
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