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From: moroney@world.std.spaamtrap.com (Michael Moroney)
Newsgroups: sci.physics
Subject: Re: Electron period
Date: Mon, 13 Feb 2017 15:56:38 +0000 (UTC)
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john <johnsefton288@gmail.com> writes:

> http://www.nature.com/nature/journal/v419/n6909/full/419789a.html

That whole article is about using a high energy pulse to kick an electron
out of an inner orbit and measuring the response time for another electron
to fall back into the hole generated, and in the process its energy kicks
out another (Auger) electron and timing that.