Ionization rates for He, Ne, and Ar subjected to laser light with wavelengths between 248.6 and 390 nm

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Hugo W. van der Hart
Department of Applied Mathematics and Theoretical Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom

Received 8 September 2005; published 17 February 2006

Usingthe R-matrix Floquet approach, we have investigated multiphoton single ionizationof helium, neon, and argon subjected to laser light witha wavelength between 248.6 and 390 nm. For a wavelength of390 nm, we have investigated ionization rates for Ne and Arat intensities up to 2.5×10¹⁴ W/cm². In this intensity regime, theionization rates no longer follow the multiphoton I^N power law.At an intensity of 2×10¹⁴ W/cm², a tunneling model approximates theAr ionization rates within a factor 3, but the differencesare much larger for Ne. The ionization rates at 390 nmare affected by intermediate resonances, with these resonances both enhancingand inhibiting ionization. Multiphoton ionization cross sections for Ne andAr at 248.6 nm have also been determined.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.023417
DOI:	10.1103/PhysRevA.73.023417
PACS:	32.80.Rm; 31.15.Ar 32.80.Rm Multiphoton ionization and excitation to highly excited states in atoms e.g., Rydberg states 31.15.Ar Ab initio calculations (atoms and molecules) YEAR: 2006
KEYWORDS:	helium neutral atoms, neon, argon, atom-photon collisions, photoionisation, multiphoton processes

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