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Título

Long-lasting molecular alignment: Fact or fiction?

AutorOrtigoso, Juan ; Rodríguez, Mirta; Santos, Julio ; Karpati, Attila; Szalay, Viktor
Fecha de publicación17-feb-2010
EditorAmerican Institute of Physics
CitaciónJournal of Chemical Physics 132(7): 074105 (2010)
ResumenIt has been suggested that appropriate periodic sequences of laser pulses can maintain molecular alignment for arbitrarily long times [J. Ortigoso, Phys. Rev. Lett. 93, 073001 (2004)]. These aligned states are found among the cyclic eigenstates of truncated matrix representations of the one-period time propagator U(T,0). However, long time localization of periodic driven systems depends on the nature of the spectrum of their exact propagator; if it is continuous, eigenstates of finite-basis propagators cease to be cyclic, in the long time limit, under the exact time evolution. We show that, for very weak laser intensities, the evolution operator of the system has a point spectrum for most laser frequencies, but for the laser powers needed to create aligned wave packets it is unknown if U(T,0) has a point spectrum or a singular continuous spectrum. For this regime, we obtain error bounds on the exact time evolution of rotational wave packets that allow us to determine that truncated aligned cyclic states do not lose their alignment for millions of rotational periods when they evolve under the action of the exact time propagator.
Descripción13 pages, 10 figures, 1 appendix.
Versión del editorhttp://dx.doi.org/10.1063/1.3312533
URIhttp://hdl.handle.net/10261/21349
DOI10.1063/1.3312533
ISSN0021-9606
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