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首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >Solid Effect Between Quadrupolar Transitions in Dilute Cu-Pd Alloys
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Solid Effect Between Quadrupolar Transitions in Dilute Cu-Pd Alloys

机译：稀铜钯合金中四极转变之间的固体效应

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摘要

The paper investigates the Dynamic Solid Effect (DSE) in Nuclear Quadrupole Double Resonance (NQDOR) on a system (dilute alloys of CuPd with 8, 42, 210, or 1000 at.ppm Pd) chosen for its simplicity and the possibility to test the theoretical concepts on which the experimental techniques (in particular the so-called Berthier-Minier technique for exhibiting the DSE) are based. NQDOR allows to observe the transitions between the Cu nuclear energy levels split by the quadrupolar interaction with the electric field gradients generated by nearby Pd atoms even in dilute alloys, in which the fraction of Cu nuclei experiencing a given field gradient is very small. The DSE permits transitions at frequencies corresponding to the sums or differences of quadrupolar level splittings at neighbouring nuclei and thus gives access to information on the spatial correlation of nuclei accessible to NQDOR studies. The DSE information is shown to be in full accord with the conclusions drawn earlier, on the basis of line-intensity arguments, on the assignment of quadrupolar transitions to the first four shells of Cu nuclei surrounding isolated Pd atoms but, in addition, allows to identify the low-frequency NQDOR lines associated with Cu nuclei in the fifth and sixth shells.
机译：本文研究了在为简单性和系统测试可能性而选择的系统（CuPd的稀合金，Pd为8、42、210或1000 at.ppm）上的核四极双共振（NQDOR）中的动态固体效应（DSE）。实验技术（尤其是用于展示DSE的所谓的Berthier-Minier技术）所基于的理论概念。 NQDOR允许观察由四极相互作用与附近的Pd原子产生的电场梯度分裂的Cu核能级之间的过渡，即使在稀合金中，其中经历给定电场梯度的Cu核比例也很小。 DSE允许以与相邻核四极能级分裂的总和或差相对应的频率进行跃迁，因此可以访问NQDOR研究可访问的有关核空间相关性的信息。根据线强度论证，DSE信息与先前得出的结论完全相符，该结论是将四极跃迁分配给围绕孤立Pd原子的Cu核的前四个壳，但此外，它还允许确定在第五和第六壳层中与Cu核相关的低频NQDOR线。

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