title: Phase-only laser control in the weak-field limit: Two-pulse control of IBr photofragmentation revisited.
abstract: We demonstrate theoretically that laser-induced coherent quantum interference control of asymptotic states of dissociating molecules is possible, starting from a single vibrational eigenstate, after the interaction with two laser pulses-at a fixed time delay-both operating in the weak-field limit. Thus, phase dependence in the interaction with the second fixed-energy phase-modulated pulse persists after the pulse is over. This is illustrated for the nonadiabatic process: I + Br(*)←IBr → I + Br, where the relative yield of excited Br(*) can be changed by pure phase modulation. Furthermore, a strong frequency dependence of the branching ratio is observed and related to the re-crossing dynamics of the avoided crossing in the above-mentioned process.
authors.affiliation: Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India.
authors.forename: Ashwani K
authors.initials: AK
authors.lastname: Tiwari
authors.affiliation: Department of Chemistry, Technical University of Denmark, Building 207, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Niels E
authors.initials: NE
authors.lastname: Henriksen