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--- classes:2009:fall:phys4101.001:q_a_1123 [2009/11/23 21:54] – yk
+++ classes:2009:fall:phys4101.001:q_a_1123 [2009/11/28 22:18] (current) – ely
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 Cathode ray tubes (http://en.wikipedia.org/wiki/Cathode_ray) are pretty standard for creating electron beams. There is plenty of information out there on them if you are curious.
+== Zeno 11/25 9am ==
+I knew there was something obvious that I was overlooking. Thanks!
+===David Hilbert's Hat 11/25 12:30pm===
+As far as I know they actually cooked silver atoms from a furnace. Wikipedia mentions that you need to have particles with a total electric charge of zero because otherwise they would deflect under the influence of a magnetic field before coming out of the apparatus - http://en.wikipedia.org/wiki/Stern-Gerlach seems to suggest that anything with a total neutral charge and unpaired electrons orbiting it can be used. If I recall correctly there is a pretty lengthy description of it in the 2000 level quantum book.
+===David Hilbert's Hat 11/25 1pm===
+Also http://hyperphysics.phy-astr.gsu.edu/Hbase/spin.html seems to have a few extra details about the silver atoms.
+===Dark Helmet 11/28 10:15===
+I don't know if it is exactly the same thing, but a free-electron laser would be a beam of electrons.  Or is that a laser made from accelerating electrons?  Now i can't remember.  Well, anyway, an electron beam wouldn't be perfectly precise even in a perfect vaccuum due to the uncertainty in the beam width.  Another one of those uncertaintly principle relations
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