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Anshum Sharma Best Answer
For atomic physics :- Atomic and Molecular Spectra by Raj Kumar Fundamentals of Molecular Spectroscopic by Banwell and Mcash For Particle Physics:- Introduction to Elementary Particles by David Griffiths This book maintains the conversational style of Griffiths as seen in his other books on electrodynamics and quantum mechanics. Though the title is Introduction, he has covered much of particle physics using quantum field theory techniques. Good luck!