※ 引述《cmh317 (Rain Man)》之銘言：
: 做習題遇到的 百思不得其解
: Bragg's law
: 2dsinΘ=mλ
: Θ=arcsin(mλ/2d)
: 題目要證明說在cubic crystal中. m＝odd時 在對應的θ觀察不到diffracted X-ray
: (hint: the unit cell in cubic crystal has symmetry property)
: 有高手可以解答嗎？ 謝謝
自問自答
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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