MSE2020LectureNotes_4_5 - - 1 B 2 B = =- = ( (-)-(-extra...

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MSE 2020 4/5/2011 Page 1 of 2 Multiplicity Factor (cont) When determining the number of permutations for a family of planes, repetition is allowed o = number of permutations number of choices possiblerepetition allowed Multiplicity (number of permutations for a family of planes) increases intensity Certain peaks will be absent in certain crystal groups o Lorenz Factor Detector picks up on a range of θ (Δθ) As θ changes, Δθ allowed changes Δθ = width at half maximum How tolerance changes with Bragg angle θ (θ dependent or not?) ± , θB ∆θ ∆θ is small = + , =
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Unformatted text preview: - 1 B 2 B = =- = ( (-)-(-extra distance 1'2' acos2 acos2 a cos B cos B ))= 2asinsinB 2asinB At B would be constructive interference; close to B is slight destructive interference (within ) and it goes to full destructive interference Relationship between 12 and I D (next class) MSE 2020 4/5/2011 Page 2 of 2 o Math Background Information Euler Relation o = + ei cos isin o For all odd multiples of : = -ei 1 o For all even multiples of : = e2i 1 o...
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This note was uploaded on 09/12/2011 for the course MSE 2020 taught by Professor Alamgir during the Spring '09 term at Georgia Institute of Technology.

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MSE2020LectureNotes_4_5 - - 1 B 2 B = =- = ( (-)-(-extra...

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