@article {2692, title = {Complete transfer of populations from a single state to a preselected superposition of states using piecewise adiabatic passage: Experiment}, journal = {Physical Review A}, volume = {80}, number = {6}, year = {2009}, note = {ISI Document Delivery No.: 539DNTimes Cited: 4Cited Reference Count: 38Zhdanovich, S. Shapiro, E. A. Hepburn, J. W. Shapiro, M. Milner, V.}, month = {Dec}, pages = {8}, type = {Article}, abstract = {We demonstrate a method of adiabatic population transfer from a single quantum state into a coherent superposition of states. The transfer is executed with femtosecond pulses, spectrally shaped in a simple and intuitive manner, which does not require iterative feedback-controlled loops. In contrast to nonadiabatic methods of excitation, our approach is not sensitive to the exact value of laser intensity. We show that the population transfer is complete, and analyze the possibility of controlling the relative phases and amplitudes of the excited eigenstates. We discuss the limitations of the proposed control methods due to the dynamic level shifts and suggest ways of reducing their influence.}, keywords = {COHERENT CONTROL, EXCITATION, PULSES, QUANTUM CONTROL, time, WAVE-PACKETS, WAVEPACKET}, isbn = {1050-2947}, url = {://000273233800104}, author = {Zhdanovich, S. and Shapiro, E. A. and Hepburn, J. W. and Shapiro,Moshe and Milner, V.} } @article {4817, title = {A semiclassical study of the photodissociation dynamics of a coupled two-surface model of HCl+ by an intense laser field in the long-wavelength limit}, journal = {Journal of Chemical Physics}, volume = {113}, number = {6}, year = {2000}, note = {ISI Document Delivery No.: 344XTTimes Cited: 7Cited Reference Count: 39}, month = {Aug}, pages = {2124-2133}, type = {Article}, abstract = {The photodissociation of HCl+ on two coupled potential surfaces is studied in the long wavelength regime with a semiclassical method employing classical trajectories and a hopping algorithm. Dissociation probabilities, product kinetic energy distributions, and branching ratios are presented. In addition, two mechanisms are introduced to explain trends in these properties. One mechanism produces large product kinetic energies and is an extension to two-coupled surfaces of the "wagging tail" mechanism seen in a previous one-surface study [M. Thachuk and D. M. Wardlaw, J. Chem. Phys. 102, 7462 (1995)]. The other mechanism is an extended barrier-suppression mechanism and accounts for the bulk of the product kinetic energy distribution, and in particular rationalizes the low energy part of these distributions as well as the branching ratios. It is shown that most of the trajectories undergo at most one nontrivial hop before dissociating so that the dynamics is dominated by the motion near the barrier to dissociation. This provides a simple, intuitive model for understanding the overall dynamics. (C) 2000 American Institute of Physics. [S0021-9606(00)00130-6].}, keywords = {ABOVE-THRESHOLD-DISSOCIATION, ALIGNMENT, COHERENT CONTROL, COULOMB EXPLOSION, H-2(+), HARMONIC-GENERATION, MOLECULAR-IONS, NM, ORDER, RESONANCE-ENHANCED IONIZATION, TRANSITIONS}, isbn = {0021-9606}, url = {://000088786900011}, author = {Gill, R. and Yanagawa, R. and Thachuk, M.} }