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348813172木蟲(chóng) (小有名氣)
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[交流]
關(guān)于TEM入射束偏轉(zhuǎn)角度的求解 已有2人參與
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Electron diffraction from a powder material gives a ring pattern. When the incoming beam is tilted an angle θ relative to the optical axis the ring pattern moves. Calculate the angle θ the incoming beam has been tilted when the center of the DP is moved so it falls on the {222} ring of the original pattern. The material is Pt (fcc) with a lattice constant 0.392 nm. The acceleration voltage is 100 kV. (Courtesy Anders Thølen.) 這個(gè)不知道怎么求解啊,請(qǐng)各位大俠賜教了 |
科研、投稿中可能遇到的小問(wèn)題 |
專家顧問(wèn) (著名寫(xiě)手)
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專家經(jīng)驗(yàn): +41 |
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我個(gè)人想法是:就當(dāng)晶體相對(duì)電子束轉(zhuǎn)了一下,正好Pt(fcc)的222晶面族發(fā)生衍射,也就是說(shuō)2dsinθ=λ λ就是100 kV的電子波長(zhǎng),d就是222晶面間距(別告訴我你這兩個(gè)都不知道咋算),θ就是你要的角度了。 思路應(yīng)該差不多這樣吧,可能會(huì)有偏差,請(qǐng)高手指點(diǎn)。 |

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