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In this lecture we discuss photoionization a bit further. We show how to obtain the ionization rate and discuss behaviour of (hydrogenic) cross section. We discuss briefly photoionization in nebulae and in more detail the behaviour of the observed Balmer Jump in stars. Course: Radiation Processes in Astronomy Lecturer: Prof. Jon Sundqvist Programme: KU Leuven Bachelor Physics & Master Astronomy & Astrophysics #astrophysics #astronomy #education I record lectures live and place them here un-edited, in the hope that it will provide a more authentic feeling of the sort: "we're doing the actual work here and now". So like I keep telling students in the classroom: whenever you discover me doing some error let me know directly; for this channel this means make a comment on the videos. Then we can have a look at it, and thereby learn nicely from each other as we continue to develop our knowledge. You find all lectures under: https://www.youtube.com/playlist?list=PLrGAIWCGSKlDXALWS_6R4Bv3D1vEk85NX I've also started to post some 'extended versions' of these lectures - sometimes including additional material from elsewhere and previous years - here: https://www.youtube.com/@JonSundqvist If you're interested more in my group's research, here're two links for that: https://fys.kuleuven.be/ster/research-projects/equation-folder/equation-home
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