p37_061 - 61. We want the reections to obey the Bragg...

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61. We want the reflections to obey the Bragg condition 2 d sin θ = ,whe re θ is the angle between the incoming rays and the reflecting planes, λ is the wavelength, and m is an integer. We solve for θ : θ = sin 1 µ 2 d = sin 1 µ (0 . 125 × 10 9 m) m 2(0 . 252 × 10 9 m) =0 . 2480 m. For m =1th i sg iv e s θ =14 . 4 . The crystal should be turned 45 14 . 4 =30 . 6 clockwise. For m =2itg ives θ =29 . 7 . The crystal should be turned 45 29 .
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