Transition between mechanisms of laser-induced field-free molecular orientation

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.112.113005
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume112
Issue11
Article number113005
SubjectDepletion mechanism; Field-free orientation; Hyper-polarizability; Laser intensities; Measurements of; Molecular ionization; Nonperturbative; Theoretical calculations; Ionization; Molecules; Molecular orientation
AbstractThe transition between two distinct mechanisms for the laser-induced field-free orientation of CO molecules is observed via measurements of orientation revival times and subsequent comparison to theoretical calculations. In the first mechanism, which we find responsible for the orientation of CO up to peak intensities of 8×1013 W/cm2, the molecules are impulsively oriented through the hyperpolarizability interaction. At higher intensities, asymmetric depletion through orientation-selective ionization is the dominant orienting mechanism. In addition to the clear identification of the two regimes of orientation, we propose that careful measurements of the onset of the orientation depletion mechanism as a function of the laser intensity will provide a relatively simple route to calibrating absolute rates of nonperturbative strong-field molecular ionization. © 2014 American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21272275
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Record identifierff2e08c1-30f7-4d2b-a901-d304334a4433
Record created2014-07-23
Record modified2016-05-09
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