Research Papers in Physics and Astronomy


Date of this Version

October 1999


Published by American Physical Society. Phys. Rev. A 60, 3311 - 3312 (1999). Copyright © 1999 American Physical Society. Permission to use.


The two-photon ionization of the metal atoms V, Cr, Y, La, and Ir sputtered by an Ar-ion gun from solid targets has been investigated using linearly polarized laser pulses of 500- fs duration and 248.6-nm (KrF) wavelength in combination with mass spectroscopy that is free of volume effects. A near-resonant ionization process has to be attributed to all five atoms. By fitting analytical solutions of a rate equation model describing the temporal evolution of the ionization process, we can determine absolute values of the one-photon cross sections and saturation intensities.

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