What (e.g., Zeeman effect, Raman spectroscopy, Laser physics) are you currently studying?

It’s important to distinguish this author from other researchers, such as Rajkumar Roychoudhury, who is a scholar primarily engaged in publishing academic papers on advanced topics within Atomic and Molecular Physics and Nonlinear Physics. While both names appear in searches, the author of the Atomic and Molecular Physics textbook is specifically Raj Kumar.

Treats diatomic molecules as harmonic and anharmonic oscillators, explaining the Morse potential energy curve.