Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Letters 82, 4791 (1999). Copyright © 1999 American Physical Society. Permission to use.


We demonstrate that a weak, static electric field enables nearly complete coherent phase control of the total ionization yield in a two-color ionization process using fundamental and second-harmonic radiation. The static electric field induces a dipole-forbidden resonance in the two-photon transition amplitude so that the final photoelectron states are identical to those in a single photon transition. We demonstrate also a phase controllable circular dichroism effect in the total photoelectron yield. Experimental realization of this process using alkali metal atoms is discussed.

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