EPL (Europhysics Letters)

DOI: 10.1209/epl/i2002-00423-y

Europhys. Lett., 58 (4) , pp. 496-502 (2002)

Resonant multiphoton X-ray optics with highly charged ions

M. Casu and C. H. Keitel

Theoretische Quantendynamik, Fakultät Physik, Universität Freiburg Hermann-Herder-Str. 3, D-79104 Freiburg, Germany

keitel@uni-freiburg.de

(Received 1 November 2001; accepted in final form 19 February 2002)

Abstract
Resonant spectra of highly charged ions are evaluated numerically in the presence of super intense high-frequency laser pulses up to 10²² $\un{W/cm^2}$ . The associated field strengths are still small compared to those inherent in highly charged ions, restricting us to the relativistic multiphoton regime. We predict the emission of hard X-ray radiation due to near-resonant multiphoton interaction with clear relativistic signatures for the one-electron ions $\chem{Xe^}$ and $\chem}$ .

PACS
33.40.+f - Multiple resonances (including double and higher-order resonance processes, such as double nuclear magnetic resonance, electron double resonance, and microwave optical double resonance).
42.50.Hz - Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic Stark shift.
32.80.Rm - Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states).

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