This textbook introduces the molecular and quantum chemistry needed to
understand the physical properties of molecules and their chemical
bonds. It follows the authors' earlier textbook "The Physics of Atoms
and Quanta" and presents both experimental and theoretical fundamentals
for students in physics and physical and theoretical chemistry. The new
edition treats new developments in areas such as high-resolution
two-photon spectroscopy, ultrashort pulse spectroscopy, photoelectron
spectroscopy, optical investigation of single molecules in condensed
phase, electroluminescence, and light-emitting diodes.