作者cmh317 (Rain Man)
看板Physics
标题Re: [请益] Bragg's law
时间Sun Jun 3 23:44:37 2007
※ 引述《cmh317 (Rain Man)》之铭言：
: 做习题遇到的 百思不得其解
: Bragg's law
: 2dsinΘ=mλ
: Θ=arcsin(mλ/2d)
: 题目要证明说在cubic crystal中. m＝odd时 在对应的θ观察不到diffracted X-ray
: (hint: the unit cell in cubic crystal has symmetry property)
: 有高手可以解答吗？ 谢谢
自问自答
http://www.hep.wisc.edu/~prepost/407/xray/xray.pdf
p11
"some of the reflections permitted by equation 18 will be absent because of
the possibility of destructive interference between waves scattered by atoms
in the same cell.
The discussion of this feature of Bragg reflection requires a further
examination of the scattering amplitude of equation 11
and a brief discussion of form and structure factors."
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