[問題] lamb shift
看到以前上課的筆記 提到lamb shift 好像沒說明些甚麼
去wiki查了一下
http://en.wikipedia.org/wiki/Lamb_shift
裡面的提到:This particular difference is a one-loop effect of quantum electrodynamics,
and can be interpreted as the influence of virtual photons that have been
emitted and re-absorbed by the atom
"one-loop effect of quantum electrody" 是什麼???
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或者有人願意說明一下lamb shift?
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