Relaxation experiments with synchrotron radiation

Relaxation experiments with synchrotron radiation
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同步加速器辐射弛豫实验

DOI:
10.1023/a:1012611313603
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发表时间:
1998
影响因子:
--
通讯作者:
R. Rüffer
R. Rüffer
中科院分区:
--
文献类型:
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作者:
O. Leupold;A. Bernhard;E. Gerdau;J. Jäschke;H. D. Rüter;Yu. Shvydko;H. de Waard;E. Alp;P. Hession;M. Hu;W. Sturhahn;J. Sutter;T. Toellner;A. Chumakov;J. Metge;R. Rüffer

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通过谱线展宽,弛豫现象出现在标准能域穆斯堡尔谱中。对此类光谱的评估在大多数情况下是采用主要在 60 年代和 70 年代发展起来的随机理论来完成的。由于同步加速器辐射的时间结构和偏振,时域中的核共振前向散射提供了有关弛豫机制的有价值的信息。我们在此主要报告核前向散射 (NFS) 实验,研究 (NH)4Al0.9557Fe0.05(SO4)2·12H2O 中 Fe3+ 离子的顺磁弛豫,并简要介绍最近对 Eu3S4 中电荷波动的研究。
Relaxation phenomena show up in standard energy domain Mössbauer spectra via line broadening. The evaluation of such spectra is in most cases done by adopting the stochastic theory mainly developed in the 60s and 70s. Due to the time structure and the polarization of the synchrotron radiation nuclear resonance forward scattering in the time domain gives valuable information on relaxation mechanisms. We report here mainly on Nuclear Forward Scattering (NFS) experiments investigating the paramagnetic relaxation of the Fe3+ ion in (NH)4Al0.9557Fe0.05(SO4)2·12H2O and briefly on recent investigations on charge fluctuations in Eu3S4.