Atoms in extreme virtual photon fields of fast, highly charged ions

Ullrich, J.; Bapat, B.; Dorn, A.; Keller, S.; Kollmus, H.; Mann, R.; Moshammer, R.; Olson, R. E.; Schmitt, W.; Schulz, M.
February 2000
AIP Conference Proceedings;2000, Vol. 506 Issue 1, p403
Academic Journal
Highly-charged ions at velocities close to the speed of light generate strong (I=10[sup 17]-10[sup 20] W/cm[sup 2]), ultra-short (t=10[sup -19]-10[sup -17] s) electromagnetic pulses when passing target atoms or molecules. Single and multiple ionization occurs and can be interpreted in terms of photoionization: at small field strength, ionization is due to the absorption or the scattering of a single virtual photon, whereas the incoherent, “simultaneous” absorption of “many” field quanta gives rise to multiple ionization in strong fields. In this paper, analogies to photoionization are investigated by comparison of kinematically complete experimental data with results of various theoretical calculations for collisions of 100 MeV/u C[sup 6+], 1000 MeV/u U[sup 92+] and 3.6 MeV/u Au[sup 53+] on He, Ne and Ar targets. Dynamical multiple ionization mechanisms are identified as a function of the momentum transfer. Two-electron final states are found to depend sensitively on the correlated initial state, and the many-particle Coulomb continuum is investigated for triple ionization of neon in super-strong fields. © 2000 American Institute of Physics.


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