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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Fluorescence-detected x-ray magnetic circular dichroism of well-defined Mn ~(II) and Ni ~(II) doped in MgO crystals: Credential evaluation for measurements on biological samples
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Fluorescence-detected x-ray magnetic circular dichroism of well-defined Mn ~(II) and Ni ~(II) doped in MgO crystals: Credential evaluation for measurements on biological samples

机译：在MgO晶体中掺杂的明确定义的Mn〜（II）和Ni〜（II）的荧光检测X射线磁性圆二色性：用于生物样品测量的证书评估

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摘要

L _(2,3)-edge X-ray magnetic circular dichroism (XMCD) spectra have been measured for the well-defined dilute Ni ~(II) and Mn ~(II) ions doped into a MgO crystal, with sub-Kelvin dilution refrigerator cooling and 2 T magnetic field magnetization. A 30-element Ge array X-ray detector has been used to measure the XMCD for these dilute ions, whose concentrations are 1400 ppm for Ni ~(II) and 10 000 ppm for Mn ~(II). Large XMCD effects have been observed for both Ni ~(II) and Mn ~(II), and multiplet simulation described the observed spectra. The fluorescence-detected L-edge absorption spectrum and XMCD of Ni ~(II) in MgO are comparable with both theoretical calculations and the total electron yield measured ions in similar chemical environments, at least qualitatively validating the use of the sensitive fluorescence detection technique for studying XMCD for dilute 3d metal ions, such as various metalloproteins. Sum rule analyses on the XMCD spectra are also performed. In addition, these XMCD measurements have also been used to obtain the samples magnetization curve and the beamlines X-ray helicity curve. This study also illustrated that bend magnet beamlines are still useful in examining XMCD on dilute and paramagnetic metal sites.
机译：已对掺杂到MgO晶体中的明确定义的稀释Ni〜（II）和Mn〜（II）离子和亚开尔文（Kelvin）进行了L _（2,3）边缘X射线磁性圆二色性（XMCD）光谱测量稀释冰箱冷却和2 T磁场磁化。已经使用30个元素的Ge阵列X射线检测器测量这些稀离子的XMCD，其浓度对于Ni〜（II）为1400 ppm，对于Mn〜（II）为10000 ppm。 Ni〜（II）和Mn〜（II）均观察到较大的XMCD效应，并且多重模拟描述了观察到的光谱。荧光检测的L-边缘吸收光谱和MgO中的Ni〜（II）的XMCD与理论计算和在类似化学环境中测得的总电子收率离子均具有可比性，至少从质量上验证了灵敏的荧光检测技术的应用研究XMCD中的3d稀金属离子，例如各种金属蛋白。还对XMCD光谱执行了求和规则分析。此外，这些XMCD测量值也已用于获得样品的磁化曲线和束线X射线螺旋度曲线。这项研究还表明，弯曲磁体束线在检查稀磁和顺磁金属部位的XMCD上仍然有用。

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