Re: Double Slit & Aharonov Bohm Effect


In volume II page 15-11 and 12 of Feynman Lectures of
Physics. Iron whiskers are mentioned as in:

"Precisely this experiment has recently been done. It is a very,
very difficult experiment. Because the wavelength of the
electrons is so small, the apparatus must be on a tiny scale
to observe the interference. The slits must be very close
together, and that means that one needs an exceedingly
small solenoid. It turns out that in certain circumstances,
iron crystals will grow in the form of very long,
microscopically thin filaments called whiskers. When
these iron whiskers are magnetized they are like a
tiny solenoid, and there is no field outside except
near the ends. The electron interference experiment
was done with such a whisker between two slits,
and the predicted displacement in the pattern of
electrons were observed".

Guys. Isn't it the official Aharonov Bohm experiment was
conducted in 1985. How could Feynman be mentioning
it in his 1964 book unless he was referring to another
experiment?. I thought 1985 was when it was first
experimentally confirmed. Can anyone all clarify this?

zh

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