do you know whether there are some modification of Davisson–Germer double slit experiment when we replace one screen with double slit with two consecutive screens with double slits separated by some distance $d$. At the first screen we could apply some sort of detector to one or another slit, at the second we have no detectors. What will be the behaviour of output interference pattern? Intuition could suggest 2 answers:
- If $d < L\propto \lambda$ where $\lambda$ is the De Brooglie wavelength, we will see no interference pattern, if $d > L$ we will see interference pattern as no first screen presented.
- No matter whatever $d$ is we will see no interference pattern, because wavefunction is collapsed.
But what are real behaviour of particles in these experiments?