...an older Quantum Mechanics book? This is the book: Fundamentals of Quantum Mechanics - Persico Fourth Printing - 1959 It is old, and the approaches may be old. In all honesty, I like older books. They don't usually go through long boring examples. I get distracted by the colors of today's texts. Here is a list of some chapters: Part 1 (There are 3 parts.) Chapter 1 - The Atomic Model Chapter 2 - Energy Quanta and Light Quanta Chapter 3 - Energy Levels Chapter 4 - Quantum Mechanics For more details of these first few chapters, please post if interested. I will not start reading it until maybe next spring. I have patience of course. Also, I will most likely get a newer book because of the abundance of questions, and possibly different approaches, but I would probably end up using this one more often if it is acceptable. I posted before on what I needed to know (https://www.physicsforums.com/showthread.php?t=41406) and I am still working on it. Thanks.