作者clarebye (clare)
看板Physics
标题[题目] X光绕射的问题
时间Mon Jan 21 00:53:46 2008
[领域] X光绕射
[来源] 考卷
[题目]
The crystal structure of diamond consists of eight atoms if the cell is
taken as the conventional cube.
(a)Derive the simplified structure factors, F(or S). Are there any special
conditions for the presence of reflections? If so state them.
(b)What is the Bracais lattice?
另一题
For the hydrogen atom in its ground state, the number density is
n(r)= exp( -r / a0 ) / ( πa0 ^3 ), where a0 is the Bohr radius.
Find the form factor of the hydrogen atom.
fH = ∫dV nj (r) exp(-iG˙r).
^ ^ ^
向量 向量
明天早上要考试 恰巧六日助教又不在实验室 不知道要找谁问 orz
麻烦大家了 谢谢
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1F:推 GSJ:第一题a 你先把原子位置列出来 代进去structure factor的 01/23 16:35
2F:→ GSJ:式子中 之後化简一番 就会得到一个含有hkl的式子 然後你就找找 01/23 16:37
3F:→ GSJ:HKL代进去式子後不使f为零的就是绕射面了 基本上dimond结构 01/23 16:40
4F:→ GSJ:状Ofcc加一个位移 所以跟fcc的绕射条件很像 只是还要符合4n 01/23 16:42
5F:→ GSJ:才符合绕射条件 印象中是这样 手边一时没书 01/23 16:46