非对称传输几何中球形非晶材料对x射线的吸收和二次散射计算。

IF 1.8 4区材料科学

Acta Crystallographica Section A Pub Date : 2013-03-01 Epub Date: 2013-01-08 DOI:10.1107/S0108767312046272

J C Bendert, M E Blodgett, K F Kelton

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引用次数: 5

摘要

给出了小光束偏心撞击球形非晶态样品时的吸收和二次散射强度比表达式。从中心轴的小偏移可以观察到吸收校正的大梯度。此外，二次散射强度比导致探测器图像的强度不对称。二次散射强度比以积分形式表示，必须进行数值计算。给出了吸收校正积分形式的解析、小角、渐近级数解。

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Calculation of absorption and secondary scattering of X-rays by spherical amorphous materials in an asymmetric transmission geometry.

Expressions for absorption and the secondary scattering intensity ratio are presented for a small beam impinging off-center of a spherical amorphous sample. Large gradients in the absorption correction are observed from small offsets from the central axis. Additionally, the secondary scattering intensity ratio causes an intensity asymmetry in the detector image. The secondary scattering intensity ratio is presented in integral form and must be computed numerically. An analytic, small-angle, asymptotic series solution for the integral form of the absorption correction is also presented.

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来源期刊

Acta Crystallographica Section A 化学-晶体学

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction imaging, time-resolved studies and the structure of strain and defects in materials. The journal has two parts, a rapid-publication Advances section and the traditional Foundations section. Articles for the Advances section are of particularly high value and impact. They receive expedited treatment and may be highlighted by an accompanying scientific commentary article and a press release. Further details are given in the November 2013 Editorial. The central themes of the journal are, on the one hand, experimental and theoretical studies of the properties and arrangements of atoms, ions and molecules in condensed matter, periodic, quasiperiodic or amorphous, ideal or real, and, on the other, the theoretical and experimental aspects of the various methods to determine these properties and arrangements.