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Molecular alignment using coherent resonant excitation: A new proposal for stereodynamic control of chemical reactions

J. Chem. Phys. 131, 164302 (2009); doi:10.1063/1.3249970

Published 26 October 2009

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Nandini Mukherjee
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
For the mode-selective control of chemical reaction, we present a new approach of molecular alignment using coherent resonant interaction with low intensity midinfrared optical pulses. Under coherent excitation, the alignment of vibrationally excited molecules becomes a function of the optical pulse area. Depending on the type of transition, with certain values of the pulse areas, a narrow group of magnetic substates are selectively excited, which results in aligning the rotational axis of the molecular ensemble. It is shown that for a P-type transition, significant alignment in the excited vibrational state can be realized using a resonant midinfrared pulse of area [approximate]2pi. Under the steady state excitation (pulse duration longer than the vibrational relaxation time), the molecular alignment is destroyed due to saturation. We design a polarization spectroscopy experiment to coherently excite and probe the molecular alignment in real time. ©2009 American Institute of Physics
History: Received 26 July 2009; accepted 28 September 2009; published 26 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/164302/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.80.-b
    Photon interactions with molecules
  • 33.80.Rv
    Multiphoton ionization and excitation to highly excited states in molecules
  • 33.20.Tp
    Vibrational analysis (molecular spectra)
  • 31.50.Df
    Potential energy surfaces for excited electronic states (atoms and molecules)
  • 33.20.Sn
    Rotational analysis (molecular spectra)
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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