# Single slit interfernce with large particels!

1. Oct 20, 2011

### Thenewdeal38

Why and how do large particles emit single slit interference, also why do electrons not. Also do single atoms display single slit interferance? How is this explained by the copanhagen interpretations as opposed to the bohm interpretation? How does bohm explain single slit collapse with electrons?

http://hexagon.physics.wisc.edu/teaching/2010s%20ph531%20quantum%20mechanics/interesting%20papers/zeilinger%20large%20molecule%20interference%20ajp%202003.pdf [Broken]

Last edited by a moderator: May 5, 2017
2. Oct 20, 2011

### xts

It has no relation to QM interpretation and require no special explanation - the effect is just predicted by wave mechanics (applied either to e-m wave or to wavefunction of a particle). Electrons and photons do that too.

The pattern created by such diffraction is called Fraunhoffer's pattern, and in case of circular slit Airy's pattern:
See: http://en.wikipedia.org/wiki/Fraunhofer_diffraction

3. Oct 20, 2011

### Thenewdeal38

I thought the interference pattern came about becaue of the interaction between the two waves?

4. Oct 20, 2011

### xts

It comes of interaction between any number of waves. According to Huygen's principle every point on the wave front may be treated as a source of new wave. If you cut (with a single, double, or any fancy mix slit) only some of sources on the front of wave, those remaining interfere creating the pattern. To find it you must integrate partial waves coming from every point of the slit. In case of circular hole - you'll get Airy's pattern. In case of long narrow slit - you'll get Fraunhoffer's one.

See: http://en.wikipedia.org/wiki/Huygensâ€“Fresnel_principle

Last edited: Oct 20, 2011