Barnes J V, Beck M, Hartweg S, Luski A, Yoder B L, Narevicius J, Narevicius E, Signorell R
Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, 8093, Switzerland.
Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.
Phys Chem Chem Phys. 2021 Jan 21;23(2):846-858. doi: 10.1039/d0cp04647g.
We describe the setup and the performance of a new pulsed Stern-Gerlach deflector and present results for small sodium-doped ammonia clusters Na(NH3)n (n = 1-4) in a molecular beam. NaNH3 shows the expected deflection of a spin ½ system, while all lager clusters show much smaller deflections. Experimental deflection ratios are compared with the values calculated from molecular dynamics simulations. The comparison reveals that intracluster spin relaxation in NaNH3 takes place on a time scale significantly longer than 200 μs. Assuming that intracluster relaxation is the cause of the reduced deflection, relaxation times seem to be on the order of 200 μs for all larger clusters Na(NH3)n (n = 2-4). Our work is a first attempt to understand the magnetic properties of isolated, weakly-bound clusters with relevance to the variety of diamagnetic and paramagnetic species expected in solvated electron systems.
我们描述了一种新型脉冲斯特恩-盖拉赫偏转器的设置和性能，并给出了分子束中钠掺杂小氨簇Na(NH₃)ₙ（n = 1 - 4）的相关结果。NaNH₃表现出预期的自旋1/2体系的偏转，而所有更大的簇表现出的偏转要小得多。将实验偏转比与分子动力学模拟计算的值进行了比较。比较结果表明，NaNH₃中的簇内自旋弛豫发生的时间尺度明显长于200微秒。假设簇内弛豫是偏转减小的原因，对于所有更大的簇Na(NH₃)ₙ（n = 2 - 4），弛豫时间似乎在200微秒量级。我们的工作是首次尝试理解与溶剂化电子体系中预期的各种抗磁性和顺磁性物种相关的孤立、弱结合簇的磁性。
