Photoelectron Spectroscopy or PES is a topic included in the redesigned AP Chemistry curriculum. I have heard quite a bit of discussion surrounding this addition. It has caused panic in some teachers because they never learned it themselves, have never taught it before and/or they have no materials to teach the topic. I have been spending some time searching for a lesson plan for my own classes. I will share what I have found. If any readers have good resources to share, I hope you will comment here.
http://www.youtube.com/watch?v=vANbxozsRSA This YouTube video gives good background information for the teacher.