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

Journal Article · Wed Feb 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.023417· OSTI ID:20974612

Hart, Hugo W. van der ^[1]

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1. Department of Applied Mathematics and Theoretical Physics, Queen's University Belfast, Belfast BT7 1NN (United Kingdom)

Using the R-matrix Floquet approach, we have investigated multiphoton single ionization of helium, neon, and argon subjected to laser light with a wavelength between 248.6 and 390 nm. For a wavelength of 390 nm, we have investigated ionization rates for Ne and Ar at intensities up to 2.5x10{sup 14} W/cm{sup 2}. In this intensity regime, the ionization rates no longer follow the multiphoton I{sup N} power law. At an intensity of 2x10{sup 14} W/cm{sup 2}, a tunneling model approximates the Ar ionization rates within a factor 3, but the differences are much larger for Ne. The ionization rates at 390 nm are affected by intermediate resonances, with these resonances both enhancing and inhibiting ionization. Multiphoton ionization cross sections for Ne and Ar at 248.6 nm have also been determined.

• OSTI ID: 20974612
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOMS
CROSS SECTIONS
HELIUM
INTERMEDIATE RESONANCE
LASER RADIATION
MULTI-PHOTON PROCESSES
NEON
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
R MATRIX
TUNNEL EFFECT
WAVELENGTHS