What is electron momentum density in solids and molecules?

Question

Can someone kindly help me to know how can i get electron momentum density for one orbital like home? 
what is the theory of electron momentum density? how can I derive electron momentum density from real electron density?
how can i use Fourier transform?

Julio · Answer

Electron momentum density $rho(p)$ is Fourier transform of electron radial density $rho(r)$.

$$rho(p)=sqrt(2/pi) (-i)^l int j(pr) rho(r) r^2 mathrm{d}r $$

What is electron momentum density in solids and molecules?

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