Jones, K.
, Julienne, P.
, Lett, P.
and Tiesinga, E.
(1999),
A Useful Approximation for Fitting Lineshapes in Photoassociation Spectroscopy of Ultracold Atoms, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed May 10, 2026)
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A Useful Approximation for Fitting Lineshapes in Photoassociation Spectroscopy of Ultracold Atoms
Published
Author(s)
Kevin Jones, , ,
Abstract
Lineshapes in photoassociation spectroscopy of ultracold (T<1 mK) atoms are asymmetric and the peak of the line is shifted by a temperature-dependent amount from the zero-temperature threshold. In principle calculating the lineshape requires a full knowledge of both the ground and excited state potentials. We demonstrate here that an approximation based on the Wigner threshold law for scattering yields a relatively simple expression which allows one to extract line positions and linewidths directly from the data. The formula contains a few parameters (threshold frequency, linewidth, temperature, height) and does not require a detailed knowledge of the molecular potentials involved. We illustrate the utility of this approach with examples for Na photoassociation of 500 K and also discuss the limitations of the approach.Citation
Physical Review A (Atomic, Molecular and Optical Physics)
Volume
61
Pub Type
Journals
Keywords
laser cooling, laser spectroscopy, lineshapes, molecular spectroscopy, photoassociation, Wigner threshold laws
Citation
Issues
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Created December 7, 1999, Updated October 12, 2021