Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 97, 123002 (2006). Copyright © 2006 American Physical Society. Permission to use.


An ab initio parametrization of the two-photon double ionization amplitude from an s2 subshell of an atom in a 1S state is presented and used to predict two light polarization effects on photoelectron angular distributions that do not exist in single-photon double ionization: (i) elliptic dichroism and (ii) circular dichroism at equal energy sharing. Estimates for He show large magnitudes for these effects, which provide a means for polarization control of double ionization by vacuum ultraviolet light.

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