Optimal control of charge transfer for slow H+ + D collisions with shaped laser pulses

Wei Zhang, Chuan Cun Shu, Tak San Ho, Herschel Rabitz, Shu Lin Cong

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We show that optimally shaped laser pulses can beneficially influence charge transfer in slow H++D collisions. Time-dependent wave packet optimal control simulations are performed based on a two-state adiabatic Hamiltonian. Optimal control is performed using either an adaptive or a fixed target to obtain the desired laser control field. In the adaptive target scheme, the target state is updated according to the renormalized fragmentary yield in the exit channel throughout the optimization process. In the fixed target scheme, the target state in the exit channel is a normalized outgoing Gaussian wave packet located at a large internuclear separation. Both approaches produced excellent optimal outcomes, far exceeding that achieved in the field-free collisional charge transfer. The adaptive target scheme proves to be more efficient, and often with complex final wave packet. In contrast, the fixed target scheme, although more slowly convergent, is found to produce high fidelity for the desired target wave packet. The control mechanism in both cases utilizes bound vibrational states of the transient HD+ complex.

Original languageEnglish (US)
Article number094304
JournalJournal of Chemical Physics
Volume140
Issue number9
DOIs
StatePublished - Mar 17 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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