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Title: Ultracold chemistry with alkali-metal–rare-earth molecules

Journal Article · · Physical Review A - Atomic, Molecular, and Optical Physics
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  1. Temple University, Philadelphia, PA (United States)
  2. Univ. of Nevada, Las Vegas, NV (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Instituto de Física Fundamental, IFF-CSIC, Madrid (Spain)

Here, a first principles study of the dynamics of 6Li(2S) + 6Li174Yb(2Σ+) → 6Li2(1Σ+) + 174Yb(1S) reaction is presented at cold and ultracold temperatures. The computations involve determination and analytic fitting of a three-dimensional potential energy surface for the Li2 Yb system and quantum dynamics calculations of varying complexities, ranging from exact quantum dynamics within the close-coupling scheme, to statistical quantum treatment, and universal models. It is demonstrated that the two simplified methods yield zero-temperature limiting reaction rate coefficients in reasonable agreement with the full close-coupling calculations. The effect of the three-body term in the interaction potential is explored by comparing quantum dynamics results from a pairwise potential that neglects the three-body term to that derived from the full interaction potential. Inclusion of the three-body term in the close-coupling calculations was found to reduce the limiting rate coefficients by a factor of two. The reaction exoergicity populates vibrational levels as high as v = 19 of the 6Li2 molecule in the limit of zero collision energy. Product vibrational distributions from the close-coupling calculations reveal sensitivity to inclusion of three-body forces in the interaction potential. In conclusion, the results indicate that a simplified model based on the long-range potential is able to yield reliable values of the total reaction rate coefficient in the ultracold limit but a more rigorous approach based on statistical quantum or quantum close-coupling methods is desirable when product rovibrational distribution is required.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396; 20140309ER
OSTI ID:
1471323
Alternate ID(s):
OSTI ID: 1181234
Report Number(s):
LA-UR-14-28770; PLRAAN
Journal Information:
Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, Issue 1; ISSN 1050-2947
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (3)

Universality and chaoticity in ultracold K+KRb chemical reactions journal July 2017
The geometric phase controls ultracold chemistry journal July 2015
Non-adiabatic quantum reactive scattering in hyperspherical coordinates journal January 2018