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Title: Measurement and modeling of hyperfine- and rotation-induced state mixing in large weakly bound sodium dimers

Abstract

We present high-precision trap loss spectroscopy of excited Na{sub 2} molecules obtained by the photoassociation of ultracold sodium atoms. Near the 3 {sup 2}S+3 {sup 2}P{sub 3/2} dissociation limit, hyperfine and rotational (Coriolis-type) interactions cause significant mixing of states of different nominal Hund's case (c) symmetry resulting in a complex pattern of spectral lines. We construct a theoretical model of the large, slowly rotating molecule starting from a long-range, atomic viewpoint. Interaction potentials are derived from the known long-range resonant dipole and van der Waals forces between atoms, supplemented at short range by the results of ab initio electronic-structure calculations. Spin-dependent interactions coupling the various angular momenta--nuclear spin, electron spin, electron orbit, and the mechanical rotation of the molecule as a whole--are derived from known atomic parameters. We avoid imposing approximate symmetries or coupling schemes and consequently include all nonadiabatic mixing of different degrees of freedom. Quantitative agreement between experiment and theory for both line positions and intensities is found. Specifically, we observe and calculate mixing of levels of 0{sub g}{sup -}, 0{sub u}{sup +}, and 1{sub g} symmetry bound by <50 GHz below the 3 {sup 2}S+3 {sup 2}P{sub 3/2} asymptote.

Authors:
; ; ; ; ;  [1]
  1. Atomic Physics Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8423, Gaithersburg, Maryland 20899 (United States)
Publication Date:
OSTI Identifier:
20717756
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 71; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.71.052703; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION SPECTROSCOPY; ATOMS; DEGREES OF FREEDOM; DIMERS; DIPOLES; DISSOCIATION; ELECTRONIC STRUCTURE; ELECTRONS; GHZ RANGE; MOLECULES; PHOTON-MOLECULE COLLISIONS; POTENTIALS; RADIATION PRESSURE; ROTATION; ROTATIONAL STATES; SODIUM; SODIUM SULFIDES; SPIN; SYMMETRY; TRAPS; VAN DER WAALS FORCES

Citation Formats

Tiesinga, Eite, Jones, Kevin M, Lett, Paul D, Volz, Udo, Williams, Carl J, and Julienne, Paul S. Measurement and modeling of hyperfine- and rotation-induced state mixing in large weakly bound sodium dimers. United States: N. p., 2005. Web. doi:10.1103/PhysRevA.71.052703.
Tiesinga, Eite, Jones, Kevin M, Lett, Paul D, Volz, Udo, Williams, Carl J, & Julienne, Paul S. Measurement and modeling of hyperfine- and rotation-induced state mixing in large weakly bound sodium dimers. United States. https://doi.org/10.1103/PhysRevA.71.052703
Tiesinga, Eite, Jones, Kevin M, Lett, Paul D, Volz, Udo, Williams, Carl J, and Julienne, Paul S. 2005. "Measurement and modeling of hyperfine- and rotation-induced state mixing in large weakly bound sodium dimers". United States. https://doi.org/10.1103/PhysRevA.71.052703.
@article{osti_20717756,
title = {Measurement and modeling of hyperfine- and rotation-induced state mixing in large weakly bound sodium dimers},
author = {Tiesinga, Eite and Jones, Kevin M and Lett, Paul D and Volz, Udo and Williams, Carl J and Julienne, Paul S},
abstractNote = {We present high-precision trap loss spectroscopy of excited Na{sub 2} molecules obtained by the photoassociation of ultracold sodium atoms. Near the 3 {sup 2}S+3 {sup 2}P{sub 3/2} dissociation limit, hyperfine and rotational (Coriolis-type) interactions cause significant mixing of states of different nominal Hund's case (c) symmetry resulting in a complex pattern of spectral lines. We construct a theoretical model of the large, slowly rotating molecule starting from a long-range, atomic viewpoint. Interaction potentials are derived from the known long-range resonant dipole and van der Waals forces between atoms, supplemented at short range by the results of ab initio electronic-structure calculations. Spin-dependent interactions coupling the various angular momenta--nuclear spin, electron spin, electron orbit, and the mechanical rotation of the molecule as a whole--are derived from known atomic parameters. We avoid imposing approximate symmetries or coupling schemes and consequently include all nonadiabatic mixing of different degrees of freedom. Quantitative agreement between experiment and theory for both line positions and intensities is found. Specifically, we observe and calculate mixing of levels of 0{sub g}{sup -}, 0{sub u}{sup +}, and 1{sub g} symmetry bound by <50 GHz below the 3 {sup 2}S+3 {sup 2}P{sub 3/2} asymptote.},
doi = {10.1103/PhysRevA.71.052703},
url = {https://www.osti.gov/biblio/20717756}, journal = {Physical Review. A},
issn = {1050-2947},
number = 5,
volume = 71,
place = {United States},
year = {Sun May 15 00:00:00 EDT 2005},
month = {Sun May 15 00:00:00 EDT 2005}
}