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Theory of laser enhancement of ultracold reactions: The fermion-boson population transfer by adiabatic passage of 6Li+6Li7Li(Tr=1  mK)-->6Li6Li+7Li(Tp=1  mK)

J. Chem. Phys. 128, 184113 (2008); doi:10.1063/1.2920186

Published 14 May 2008

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Xuan Li and Gregory A. Parker
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA
We present a new theory of population transfer by adiabatic passage. This theory relates laser catalysis to adiabatic passage, enhancing chemical reactions with the freedom to choose the translational energies of the reactants and products separately. The process, A+BC<-->[h-bar]omegapABC*(v)<-->[h-bar]omegasAB+C, involves two laser fields that are slowly varying so the process is adiabatic, and sufficiently intense so the population of the intermediate bound complex (ABC) is minimized. We apply this theory to the collinear exchange reaction 6Li+7Li2(Tr)<-->[h-bar]omegap(6Li7Li7Li)*<-->[h-bar]omegas6Li7Li(Tp)+7Li. We show that at translational energies Tp=Tr=1  mK with a narrow energy bandwidth of deltaE=0.01  mK, we can obtain nearly total (>=98%) population transfer from the reactant to the product states. This can be done with a pump laser and a Stokes laser in an “intuitive” sequence (tp<ts) at a low intensity (Ip<=600  MW/cm2) and a “coincident” sequence (tp=ts) at a higher intensity. ©2008 American Institute of Physics
History: Received 21 March 2008; accepted 14 April 2008; published 14 May 2008
Permalink: http://link.aip.org/link/?JCPSA6/128/184113/1
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KEYWORDS and PACS

Keywords
PACS
  • 33.80.-b
    Photon interactions with molecules
  • 82.30.Hk
    Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)
  • 82.65.+r
    Surface and interface chemistry; heterogeneous catalysis at surfaces
  • YEAR: 2008

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PUBLICATION DATA

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