Mechanisms of two-color laser-induced field-free molecular orientation

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.109.113001
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume109
Issue11
Article number113001
SubjectCO molecule; Dominant mechanism; Field-free orientation; Hyper-polarizability; Ionization mechanisms; Ionization thresholds; Laser induced; Orientation mechanism; Two-color; Ionization; Molecular orientation
AbstractTwo mechanisms of two-color (ω+2ω) laser-induced field-free molecular orientation, based on the hyperpolarizability and ionization depletion, are explored and compared. The CO molecule is used as a computational example. While the hyperpolarizability mechanism generates small amounts of orientation at intensities below the ionization threshold, ionization depletion quickly becomes the dominant mechanism as soon as ionizing intensities are reached. Only the ionization mechanism leads to substantial orientation (e.g., on the order of cosθ0.1). For intensities typical of laser-induced molecular alignment and orientation experiments, the two mechanisms lead to robust, characteristic timings of the field-free orientation wave-packet revivals relative to the alignment revivals and the revival time. The revival timings can be used to detect the active orientation mechanism experimentally.
Publication date
LanguageEnglish
AffiliationNRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number21269184
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Record identifierdf0d4079-a8a3-4263-bda1-3cb10df29b58
Record created2013-12-12
Record modified2016-05-09
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