English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the effect of hyperfine interactions on ultracold molecularcollisions in magnetic fields, using ^{24}Mg(^1S) + ^{14}NH(^3Sigma^-) as aprototype system. We explore the energy and magnetic field dependence of thecross sections, comparing the results with previous calculations that neglectedhyperfine interactions (Phys. Rev. Lett. 103, 183201 (2009)). The main effectof hyperfine interactions for spin relaxation cross sections is that thekinetic energy release of the dominant outgoing channels does not reduce tozero at low fields. This results in reduced centrifugal suppression on thecross sections and increased inelastic cross sections at low energy and lowfield. We also analyze state-to-state cross sections, for various initialstates, and show that hyperfine interactions introduce additional mechanismsfor spin relaxation. In particular, there are hyperfine-mediated collisions tooutgoing channels that are not centrifugally suppressed. However, for Mg+NHthese unsuppressed channels make only small contributions to the total crosssections. We consider the implications of our results for sympathetic coolingof NH by Mg and conclude that the ratio of elastic to inelastic cross sectionsremains high enough for sympathetic cooling to proceed.

The effect of hyperfine interactions on ultracold molecular collisions: NH(^3Sigma^-) with Mg(^1S) in magnetic fields