Publication details for Prof. Jeremy M. HutsonHutson, Jeremy M. (2007). Feshbach resonances in ultracold atomic and molecular collisions: threshold behaviour and suppression of poles in scattering lengths. New Journal of Physics 9: 152.
- Publication type: Journal Article
- ISSN/ISBN: 1367-2630
- DOI: 10.1088/1367-2630/9/5/152
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
In the absence of inelastic scattering, Feshbach resonances produce poles in scattering lengths and very large peaks in elastic cross-sections. However, inelastic scattering removes the poles. Whenever the resonant state is coupled comparably to the elastic and inelastic channels, the scattering length exhibits only a small oscillation and peaks in cross-sections are significantly suppressed. A resonant scattering length is defined to characterize the amplitude of the oscillation, and is shown to be small for many collisions of ultracold molecules. The results suggest that cross-sections for some ultracold collision processes will be much less sensitive to details of the potential than has been expected.