Chadwick Helen, Alkoby Yosef, Cantin Joshua T, Lindebaum Dennis, Godsi Oded, Maniv Tsofar, Alexandrowicz Gil
Department of Chemistry, College of Science, Swansea University, Swansea, SA2 8PP, UK.
Phys Chem Chem Phys. 2021 Apr 7;23(13):7673-7681. doi: 10.1039/d0cp05399f. Epub 2020 Dec 17.
In this paper we demonstrate that a molecular beam of hydrogen molecules can be magnetically manipulated to produce multiple coherences in the molecular interference pattern. Unlike spin 1/2 magnetic beam experiments, i.e., neutron and helium spin echo, the nuclear and rotational magnetic moments in a molecule are strongly coupled. We show experimentally and theoretically that this coupling leads to multiple magnetic field conditions under which the magnetic moment of molecules travelling with different speeds can be coherently refocussed. We also demonstrate that these multiple coherence signals are extremely sensitive to the scattering event, opening up new possibilities for measuring molecule-surface interactions.
在本文中，我们证明了氢分子的分子束可以通过磁操控在分子干涉图样中产生多重相干。与自旋1/2磁束实验（即中子和氦自旋回波）不同，分子中的核磁矩和旋转磁矩强烈耦合。我们通过实验和理论表明，这种耦合导致了多种磁场条件，在这些条件下，以不同速度行进的分子的磁矩可以被相干地重新聚焦。我们还证明了这些多重相干信号对散射事件极其敏感，为测量分子-表面相互作用开辟了新的可能性。
