Bragg

Quasi-Bragg

Comment

$n\lambda =2d\sin \left(\theta \right)$

Harmonic laws

Give ${\theta }^{\prime }=\theta /c_s$

Including iterations

(Appendix 2)

q-Structure factors

Give c_s, $a^{\prime }$ and d'

$d=a/h$

$d^{\prime }=a{c}_s\tau$

$d=a{\left(h^2+k^2+l^2\right)}^{-1/2}$

$d^{\prime }=d{c}_s$

hastily Measured $a$

$a=0.205\text{nm}$

Corrected measurement

$a^{\prime }=0.29\text{nm}$

(Appendix 3)

Measured quasi-lattice-parameter

0.29 nm = dia(Al)