Required Text: Do you need it?
The official text for the course is Peter Atkins Physical Chemistry (6th edition, 1998).
This book has been chosen as the standard text for both of the core physical chemistry courses (CHEM 260 and CHEM 360). However, I (Dr. Percival) don't teach or assign problems from a book, so feel free to choose an alternative. Any standard physical chemistry text should do, as long as it is aimed at Chemistry Majors. There are also many specialist texts on quantum chemistry (e.g. the book by McQuarrie), but they typically introduce topics in a more mathematical way than CHEM 260.