McCarthy J E, Cooper M J, Lawson P K, Timms D N, Manninen S O, Hämäläinen K, Suortti P
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble CEDEX, France.
J Synchrotron Radiat. 1997 Mar 1;4(Pt 2):102-9. doi: 10.1107/S0909049596015002.
The magnetic Compton profile of Fe [111] was measured using circularly polarized synchrotron radiation at incident energies of 84.4, 167.2 and 256.0 keV on the high-energy beamline at the European Synchrotron Radiation Facility. It was found that the momentum resolution of these experiments, which use semiconductor detectors, improves by almost a factor of two over what was previously possible by this technique at photon energies of approximately (1/10)mc(2). It was also observed that all three spectra reduced to the magnetic Compton profile, describing the spin-dependent ground-state momentum density, and that within the experimental error the integrated intensity of the magnetic effect scaled as predicted by the cross section derived in the limit of energies much less than the rest energy of the electron. The magnetic Compton profile of Fe [111], measured using 167.2 keV incident energy and with momentum resolution of 0.42 a.u., was compared with the prediction from a full-potential linearized augmented-plane-wave model profile. The fine structure predicted by theory was confirmed by the experimental profile at this improved resolution.
利用圆偏振同步辐射，在欧洲同步辐射装置的高能束线上，于84.4、167.2和256.0 keV的入射能量下测量了Fe [111]的磁康普顿轮廓。结果发现，这些使用半导体探测器的实验的动量分辨率，比此前在光子能量约为(1/10)mc(2)时该技术所能达到的分辨率提高了近两倍。还观察到，所有三个光谱都简化为磁康普顿轮廓，描述了自旋相关的基态动量密度，并且在实验误差范围内，磁效应的积分强度按能量远小于电子静止能量时导出的截面所预测的那样缩放。将使用167.2 keV入射能量且动量分辨率为0.42 a.u.测量的Fe [111]的磁康普顿轮廓，与全势线性缀加平面波模型轮廓的预测结果进行了比较。理论预测的精细结构在这种提高的分辨率下得到了实验轮廓的证实。
