X光非均向性共振多光動力繞射

Anisotropic Resonant Multi-Wave Dynamical X-ray Diffraction

邱奕樺(Yi-Hua Chiu)

指導教授 ： 張石麟

國立清華大學/理學院/物理學系/碩士(2013年)

https://doi.org/10.6843/NTHU.2013.00557

摘要

本論文主要探討主體為晶體與入射光的能量介於X光頻率波段並假設X光在晶體裡是呈彈性散射， 本論文主要分成兩個部分：
第一個主部分是最主要的部份，旨在探討在共振繞射下，將結構因子以張量形式帶入動力繞射計算DAFS與多光繞射，並與FDMNES的DAFS做比較以確定此演算法的正確性，之後再以理論計算出來的多光繞射圖與對實驗上的多光繞射做比較．這個部分的程式是以MATLAB撰寫，撰寫版本為MATLAB R2012a．
第二個部分則是關於繞射儀SPEC系統下的虛擬馬達巨集(Pseudo Motor Macros)，此巨集的最基本功能是以同時移動Theta, Chi, Phia達來達到對載台執行任意方向上的旋轉之目的，而由此基本功能衍生應用，可以進而解決在無法調平的情況下，對樣品執行Renninger Scan．這個部分的巨集程式是以繞射儀軟體SPEC撰寫，SPEC的操作版本是Release 5．

附錄則是對於前兩個部份的程式說明與教學．

關鍵字

非均向性 ； X光 ； 多光 ； 動力繞射 ； 共振繞射 ； 未調平

並列摘要

This thesis is separated into two parts:
The first part is mainly, focused on anisotropic resonant diffraction situation.
We modified the algorithm for solving multiple-wave dynamical X-ray diffraction equations by taking into account of the structure factor of tensor form.
In the last section of this part, we compare our simulated graph with the FDMNES program by DAFS to confirm the accuracy of our theory, then we could succeed in simulating the anisotropic resonant multi-wave dynamical X-ray diffraction.
The software in this part is programmed by MATLAB R2012a.

The second part reports a macro on the SPEC(diffractometer software) system to fulfill a pseudo motor, which could simultaneously remote the Theta,Chi and Phi motors to execute a rotation at an arbitrary azimuth.
For application, we could solve the problem of performing Renninger Scan to a crystal under the non-flatting situation, i.e.,the crystal orientation does not coincide with any rotation axis.
This part of macro is operated on SPEC, and the operating version of SPEC is Release 5.

The appendix is attached with the instructions of the program and macro we've developed.

並列關鍵字

anisotropy ； resonant ； multi-wave ； diffraction ； FDMNES ； Renninger ； X-ray ； non-flatting

參考文獻

[5] 邱茂森. X光共振腔之24光動力繞射計算. PhD thesis, 清華大學, July 2008.

[1] C. Kittel. Introduction to Solid State Physics, pages 28–36. John Wiley & Sons, Inc., 8th edition, 2005.

[2] 黃志仁C.-J. Huang. X光廣角入射波導管之波導干涉guiding and interference effects of wide-angle x-ray incident waveguide. Master’s thesis, National Tsing Hua University, 2009.

[6] Yu. P. Stetsko and S.-L. Chang. An algorithm for solving multiple-wave dynamical x-ray diffraction equations. Acta Cryst. A, 53(1):28–34, 1997.

[7] S.-L. Chang. X-Ray Multiple-Wave Diffraction Theory and Application, pages 89–141. Springer, 2nd edition, 2004.