High-Energy Cutoff in the Spectrum of Strong-Field Nonsequential Double Ionization

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J. S. Parker,¹ B. J. S. Doherty,¹ K. T. Taylor,¹ K. D. Schultz,² C. I. Blaga,² and L. F. DiMauro²
¹DAMTP, Queen's University Belfast, Belfast, BT7 1NN, United Kingdom
²Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA

Received 13 December 2005; published 6 April 2006

Electronenergy distributions of singly and doubly ionized helium in anintense 390 nm laser field have been measured at two intensities(0.8 PW/cm² and 1.1 PW/cm², where PW [equivalent] 10¹⁵ W/cm²). Numerical solutions of the full-dimensionaltime-dependent helium Schrödinger equation show excellent agreement with the experimentalmeasurements. The high-energy portion of the two-electron energy distributions revealsan unexpected 5U_p cutoff for the double ionization (DI) processand leads to a proposed model for DI below thequasiclassical threshold.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.133001
DOI:	10.1103/PhysRevLett.96.133001
PACS:	32.80.Fb; 31.90.+s; 32.80.Rm 32.80.Fb Photoionization of atoms and ions 31.90.+s Other topics in the theory of the electronic structure of atoms and molecules (restricted to new topics in section 31) 32.80.Rm Multiphoton ionization and excitation to highly excited states in atoms e.g., Rydberg states YEAR: 2006
KEYWORDS:	helium neutral atoms, photoionisation, atom-photon collisions, Schrodinger equation