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Title: Long-lived complexes and signatures of chaos in ultracold K 2 +Rb collisions

Abstract

Lifetimes of complexes formed during ultracold collisions are of current experimental interest as a possible cause of trap loss in ultracold gases of alkali-metal dimers. Microsecond lifetimes for complexes formed during ultracold elastic collisions of K 2 with Rb are reported, from numerically exact quantum-scattering calculations. Thermally averaged lifetimes are compared with those calculated using a simple density-of-states approach, which are shown to be reasonable. This validates the density-of-states approach and suggests that the formation of long-lived complexes is indeed the cause of observed experimental trap loss in ultracold alkali-metal-dimer systems. Long-lived complexes correspond to narrow scattering resonances which we examine for the statistical signatures of quantum chaos, finding that the positions and widths of the resonances are in good agreement with the Wigner-Dyson and Porter-Thomas distributions, respectively.

Authors:
 [1];  [1]; ORCiD logo [2]
  1. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1524374
Alternate Identifier(s):
OSTI ID: 1413815
Report Number(s):
LA-UR-17-29347
Journal ID: ISSN 2469-9926; PLRAAN
Grant/Contract Number:  
89233218CNA000001; 20170221ER; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Astronomy and Astrophysics; Inorganic and Physical Chemistry; ultracold chemical reactions; quantum dynamics

Citation Formats

Croft, J. F. E., Balakrishnan, N., and Kendrick, B. K. Long-lived complexes and signatures of chaos in ultracold K2 +Rb collisions. United States: N. p., 2017. Web. doi:10.1103/PhysRevA.96.062707.
Croft, J. F. E., Balakrishnan, N., & Kendrick, B. K. Long-lived complexes and signatures of chaos in ultracold K2 +Rb collisions. United States. doi:10.1103/PhysRevA.96.062707.
Croft, J. F. E., Balakrishnan, N., and Kendrick, B. K. Mon . "Long-lived complexes and signatures of chaos in ultracold K2 +Rb collisions". United States. doi:10.1103/PhysRevA.96.062707. https://www.osti.gov/servlets/purl/1524374.
@article{osti_1524374,
title = {Long-lived complexes and signatures of chaos in ultracold K2 +Rb collisions},
author = {Croft, J. F. E. and Balakrishnan, N. and Kendrick, B. K.},
abstractNote = {Lifetimes of complexes formed during ultracold collisions are of current experimental interest as a possible cause of trap loss in ultracold gases of alkali-metal dimers. Microsecond lifetimes for complexes formed during ultracold elastic collisions of K2 with Rb are reported, from numerically exact quantum-scattering calculations. Thermally averaged lifetimes are compared with those calculated using a simple density-of-states approach, which are shown to be reasonable. This validates the density-of-states approach and suggests that the formation of long-lived complexes is indeed the cause of observed experimental trap loss in ultracold alkali-metal-dimer systems. Long-lived complexes correspond to narrow scattering resonances which we examine for the statistical signatures of quantum chaos, finding that the positions and widths of the resonances are in good agreement with the Wigner-Dyson and Porter-Thomas distributions, respectively.},
doi = {10.1103/PhysRevA.96.062707},
journal = {Physical Review A},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

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Works referenced in this record:

Molecular Reaction Dynamics
book, January 2005