This book discusses the selected applications of quantum mechanics with the help of in-depth information. Quantum mechanics has found vital applications in numerous distinct fields within human knowledge ever since its discovery. The unique distinction of quantum mechanics is that it plays important roles in various diverse fields like solid state physics, biotechnology, nanotechnology, nuclear physics, crystallography, atomic and molecular spectroscopy and astrophysics among others. Authors from across the globe have contributed worthy information in this book to meet the emerging needs in this area. The aim of this book is to serve as a valuable source of reference for students and researchers.