title: Optimal control of multiphoton ionization processes in aligned I2 molecules with time-dependent polarization pulses.
abstract: Multiphoton ionization processes in aligned I2 molecules are actively controlled by the homemade pulse shaping system, with which a time-dependent polarization pulse can be generated and controlled. We find a correlation between a femtosecond time-dependent polarization pulse and the production efficiency of evenly or oddly charged molecular ions. We achieve much better controllability of the correlation with a time-dependent polarization pulse than with a pulse having a fixed ellipticity. The results suggest the existence of an unknown tunnel ionization mechanism which is characteristic of a time-dependent polarization pulse. Our experiments point to new directions in optimal control studies with molecular systems, as discussed in the text.
authors.affiliation: Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Suzuki
authors.forename: Shinichirou
authors.initials: S
authors.lastname: Minemoto
authors.forename: Tsuneto
authors.initials: T
authors.lastname: Kanai
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Sakai