Atomic Processes in High-Intensity, High-Frequency Laser Fields
A nonperturbative theory is described for electron-atom interactions in intense, high-frequency laser fields. It is illustrated on the case of free-free transitions of electrons colliding with a potential, and on the multiphoton ionization of one-electron atoms. Transition amplitudes are obtained, and their validity is discussed. The theory applies at already existing excimer laser frequencies (and intensities), but extends beyond, into the, XUV range. It is shown that in this regime collisions are dominated by the clastic channel, and that the atom, although possibly strongly distorted, has a small decay rate. Numerical results are presented for the laser-modified elastic scattering from a Coulomb potential.
KeywordsElastic Scattering Excimer Laser Laser Field Schrodinger Equation Multiphoton Ionization
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