Re: I HAVE JUST MADE THE MOST AMAZING DISCOVERY!!!
^You're talking about Rutherford and his backscattering experiments. Real close, but he actually shot alpha particles through a gold foil, instead of light.
This was still in the times of the "plum pudding" model. His experiment, and the fact the the alpha particles did scatter, including some being scattered almost straight backwards, showed that atoms have a large, positive nucleus, leading to the Rutherford model that everyone now learns in chemistry before they know any quantum mechanics, with the cute little rings of electrons around the nucleus.
Of course, quantum mechanics all came along soon after Rutherford, so his model didn't really last all that long, but it is still taught today as a precursor or for those who will never go as far as QM.