title: Elliptic and circular dichroism effects in two-photon double ionization of atoms.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, The University of Nebraska, Lincoln, NE 68588-0111, USA.
authors.forename: Andrei Y
authors.initials: AY
authors.lastname: Istomin
authors.forename: E A
authors.initials: EA
authors.lastname: Pronin
authors.forename: N L
authors.initials: NL
authors.lastname: Manakov
authors.forename: S I
authors.initials: SI
authors.lastname: Marmo
authors.forename: Anthony F
authors.initials: AF
authors.lastname: Starace