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Optimal molecular alignment and orientation through rotational ladder climbing

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Date
2005-07
Dewey
Probabilités et mathématiques appliquées
Sujet
rotational states; radiation pressure; electric field effects; molecular orientation
Journal issue
The Journal of Chemical Physics
Volume
123
Number
14
Publication date
10-2005
Article pages
144310
DOI
http://dx.doi.org/10.1063/1.2049270
URI
https://basepub.dauphine.fr/handle/123456789/386
Collections
  • CEREMADE : Publications
Metadata
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Author
Dion, Claude M.
Turinici, Gabriel
Salomon, Julien
Type
Article accepté pour publication ou publié
Abstract (EN)
We study the control by electromagnetic fields of molecular alignment and orientation in a linear, rigid-rotor model. With the help of a monotonically convergent algorithm, we find that the optimal field is in the microwave part of the spectrum and acts by resonantly exciting the rotation of the molecule progressively from the ground state, i.e., by rotational ladder climbing. This mechanism is present not only when maximizing orientation or alignment, but also when using prescribed target states that simultaneously optimize the efficiency of orientation/alignment and its duration. The extension of the optimization method to consider a finite rotational temperature is also presented. ©2005 American Institute of Physics

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