电子显微分析期末考试题-章晓中
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材料科学系列考试题目电子显微分析20100115
电子显微分析（B卷）
章晓中老师
the brief of the questions and the reference answers
Section I (2 marks of each question,2*10=20; answer in English)
1. texture of a thin steel specimen, and not have the instrument to thick it. Which technology can be used? EBSD
2. want to observe the water-containing biological specimen. Which sort of SEM technology can be used? ESEM/VPSEM(but they are not technologies)
3. DF model to observe the screw dislocation of fcc material. (020) can see, (200) and (11-1) can’t see. determine the burgers vector. 1/2[011](…)
4. Kikuchi line can apply to measure the tilt angle. Kikuchi line moves 4mm. How many degree does the specimen tilt? (the camera length is 800mm) 0.29º
5. The side length of the CRT is 10cm and the scan length on the specimen is 0.5mm. What is the real size of a particle with 5mm length on the CRT. 2.5μm
6. A student indexes the diffraction pattern of a single crystal with fcc lattice. He get (000), (002), (1-12),… Is this right? No Why? hkl are either even or odd, the (1-12) can’t appear.
7. separate the Al Kα1,2 1487 and the Kα3,4 1497. Which technology should be used? WDS
8. resolution better than 0.09nm. Which kind of TEM can get? Cs-corrected TEM
9. determine diamond like carbon or evaporated carbon? EELS
10. see the structure of the specimen. Don’t need to change contrast of the image to alter with defocus. HADDF
Section II (3*10=30; answer in English or Chinese)
1. why ESEM can see the specimen containing water? why can reduce the charging problem?
2. calculate the theoretical resolution of the TEM with accelerating voltage 40kV, assuming n=1, sinα=0.95.
3. why can TEM observe both the image and diffraction?
Section III (15+20+15=50marks; answer in English) Use the appendix!!!
1. diffraction pattern of a fcc material as shown, R1=R2=10mm, R3=16.3mm, the angle θ1 between R1 and R2 is 70º, θ2between R2 and R3 is 35º. Index the pattern, and determine the orientation of the crystal.
2. Plot out and superimpose the zero order and the lowest order of (431) Laue zone for bcc system. (The details of the calculation must be given)
3. The diameter of the inner three rings of a polycrystalline Au material(fcc, a=0.407nm) are d1=17.6mm, d2=20.5mm, d3=28.5mm,respectively. The accelerating voltage is 150kV. Calculate the camera length.
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