Asymmetric electron-nuclear dynamics in two-color laser fields: Laser phase directional control of photo-fragments in H[sub 2][sup +]

Bandrauk, Andre´ D.; Chelkowski, Szczepan
July 2000
AIP Conference Proceedings;2000, Vol. 525 Issue 1, p547
Academic Journal
Exact non-Born-Oppenheimer, numerical solutions of the time-dependent Shcro¨dinger equation (TDSE) for the 1-D H[sub 2][sup +] molecule in an intense, two-color (ω+2ω) laser field, have been obtained. Both, electron (ATI) and proton (ATD) kinetic energy spectra show spatial, correlated, asymmetric distributions. The calculated spectra exhibit same unusual correlations as in experiments, in which both positively charged nuclear fragments and negatively charged photo-electrons were preferentially emitted in the same direction. It is found that, for the case when the combined electric field is most asymmetric (&fgr;=0), the electron is ionized in a “counter-intuitive” direction: i.e., more electrons ionize in the direction to which the maximum of the combined (ω+2ω), asymmetric, electric field is pointed. The above asymmetries of photoemission of electrons seen in our quantum simulation are interpreted in the framework of a quasistatic tunneling model. © 2000 American Institute of Physics.


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