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A: Atomphysik

A 20: Atoms in Fields

A 20.12: Vortrag

Freitag, 6. April 2001, 18:30–18:45, H1058

ATOMS AND MOLECULES IN A STRONG LASER FIELD. MULTI-PHOTON RESONANCES AND SCATTERING OF LIGHT. IONIZING RADIATION BIOCELLULAR EFFECT — •Alexander Glushkov — Atom.-Nucl.-Mol. Spectr. Centre and Inst. Appl. Math. OHMI, P.O. Box 108, Odessa-9, 65009, Ukraine

QED approach based on S-matrix Gell-Mann and Low formalism is used for studying the interaction of the atoms and molecules with a strong laser field. The kphoton emission and absorption lines are calculated for the Lorentz and Gauss (single-, multi-mode) laser pulse shape. Multi-photon resonance and ionization profiles in H, Na, Cs atoms are calculated. The phenomenon of the above threshold ionization is studied. Comparison with the eigen-channel R-matrix calculations of Luc-Koenig et al for Mg is given. Method is generalized for description of the multi-photon processes and applied to analysis of multi-photon resonances in SF₆ molecule. QED theory for the Rayleigh and Raman vibrational scattering of light on the metastable molecular levels is developed. The polarizability, depolarization degree estimates for Rayleigh and Raman light scattering at frequencies of Nd and Rb lasers are presented for H₂,HD, D₂ molecules.

The finite temperature version of S-matrix formalism is developed and used in study of radiation action mechanism on biological targets.