Virtual particles in Feynman diagrams

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upload_2018-3-16_8-53-21.png

In the first diagram above, if I understand it correctly, the photon turns into an electron positron pair and then back again to a photon. However, what exactly is happening in the second diagram at the bottom left hand corner? Is the electron being converted to an electron photon pair?
 

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  • #2
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To the extent that a Feynmann diagram shows something "happening" (which is to say, not much at all) the electron is emitting and then reabsorbing a photon.
 
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