Long-lived complexes and signatures of chaos in ultracold +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 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.
- Authors:
-
- Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry
- 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}
}
Web of Science
Figures / Tables:

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