Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization

A. Rudenko; K. Zrost; Th. Ergler; B. Feuerstein; V. L. B. de Jesus; C. D. Schröter; R. Moshammer; J. Ullrich

doi:10.1117/12.682359

22 May 2006 Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization

A. Rudenko, K. Zrost, Th. Ergler, B. Feuerstein, V. L. B. de Jesus, C. D. Schröter, R. Moshammer, J. Ullrich

Proceedings Volume 6256, ICONO 2005: Ultrafast Phenomena and Physics of Superintense Laser Fields; Quantum and Atom Optics; Engineering of Quantum Information; 62560D (2006) https://doi.org/10.1117/12.682359
Event: ICONO 2005, 2005, St. Petersburg, Russian Federation

Abstract

We present results of high resolution fully differential measurements on single ionization of He, Ne, and Ar by 7-25 fs linearly polarized 800nm laser pulses at intensities of up to 2^.10¹⁵ W/cm². Using a 'Reaction-Microscope' we were able to trace signatures of multiphoton ionization deep into the tunnelling regime. Surprisingly, in the low-energy electron spectra we observed several features (absence of the ponderomotive shifts, splitting of the peaks, their degeneration for few-cycle laser pulses) typical for resonantly-enhanced ionization. Other remarkable features, as the sharp cusp-like momentum distributions in the direction perpendicular to the laser field or the observed minima at zero longitudinal momentum for He and Ne, can be reproduced by semiclassical models, where the electron motion in the combined laser and Coulomb field is treated classically after the tunnelling.

Citation Download Citation

A. Rudenko, K. Zrost, Th. Ergler, B. Feuerstein, V. L. B. de Jesus, C. D. Schröter, R. Moshammer, and J. Ullrich "Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization", Proc. SPIE 6256, ICONO 2005: Ultrafast Phenomena and Physics of Superintense Laser Fields; Quantum and Atom Optics; Engineering of Quantum Information, 62560D (22 May 2006); https://doi.org/10.1117/12.682359

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