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Atoms and Molecules in Intense Laser Fields

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Studies have been performed of the full electronic response of the helium atom to intense laser radiation and of the hydrogen molecule to x-ray radiation. The first calculations have resolved the energies of the outgoing two-electron wave-packet produced by Ti:Sapphire laser light impinging on the atom. This is the first reliable quantitative study of the time-delay between single- and double-ionization at Ti:Sapphire wavelengths.

 

 
 

The plots display the probability of electron ejection densities along the polar axis as a function of time. Single ionization jets form the cross in the centre of the diagrams. Double ionization ejections occur in the z1 = -z2 quadrants (right-hand figure). The dots on the upper E-field plots indicate the instants of time during this excitation by a laser pulse of wavelength 20nm.

 
 

 
 

Single and double ionization yields for helium exposed to a laser pulse of wavelength 390 nm.

 

Few-Electron Dynamics of Atoms and Molecules in Intense Laser Fields,
K T Taylor, J S Parker, D Dundas, K J Meharg, B J S Doherty and J F McCann,
Physica Scripta, Vol. T1 10 154-160, 2004.

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