If you prefer a physical copy for study, it is typically in stock at specialty academic publishers and retailers:
The textbook is structured into 13 comprehensive chapters that guide students from classical theories to modern quantum mechanical applications. rajkumar atomic and molecular physics pdf
While this runs in a legal grey area, LibGen is the largest repository of academic texts. Search for "Rajkumar - Atomic Physics" (sometimes the exact title varies). Pro tip: Check the file size; anything under 10MB likely lacks diagrams. If you prefer a physical copy for study,
The molecular portion of the text demystifies how atoms bond and interact: rajkumar atomic and molecular physics pdf
If you are searching for the PDF, you likely need these specific units. A standard Rajkumar-style book covers:
Raj Kumar (Author of Atomic & Molecular Spectra) - Goodreads