Long-lived complexes and signatures of chaos in ultracold K2 +Rb collisions

doi:10.1103/PhysRevA.96.062707

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:

Croft, J. F. E. ^[1]; Balakrishnan, N. ^[1];

^[2]

Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: 2017-12-18

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.

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                    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.

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                    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.

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@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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DOI: 10.1103/PhysRevA.96.062707

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Works referenced in this record:

Molecular Reaction Dynamics
book, January 2005

Levine, Raphael D.
DOI: 10.1017/CBO9780511614125

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

Abstract

Citation Formats

Molecular Reaction Dynamics book, January 2005

Title: Long-lived complexes and signatures of chaos in ultracold $K_{2}$ +Rb collisions

Molecular Reaction Dynamics
book, January 2005