Atomic And Molecular Spectra Laser By Rajkumar Pdf 56 Apr 2026

| Spectral Feature | Energy Scale | Typical Laser Use | |------------------|--------------|-------------------| | | 0.1–10 cm⁻¹ (microwave) | Rotational Raman lasers, THz generation | | Vibrational | 500–4000 cm⁻¹ (mid‑IR) | CO₂ laser (10.6 µm), tunable OPOs | | Electronic | 10⁴–10⁵ cm⁻¹ (UV‑Vis) | Dye lasers, Ti:Sapphire (tunable visible‑NIR) | 3.1 The Diatomic Approximation For a diatomic molecule AB, the total energy is approximated as:

[ E_total \approx E_elec + \underbraceB_v J(J+1) \textrotational + \underbrace\omega_e\left(v+\frac12\right) \textvibrational ] Atomic And Molecular Spectra Laser By Rajkumar Pdf 56

| Chapter | Core Focus | Typical Sub‑topics | |---------|------------|--------------------| | | Fundamentals of atomic structure | Quantum numbers, selection rules, fine & hyperfine splitting | | II | Molecular energy levels | Rotational, vibrational, electronic states, rovibronic spectra | | III | Laser physics fundamentals | Pumping mechanisms, gain media, resonator design | | IV | Laser–spectroscopy techniques | Absorption, fluorescence, Raman, cavity‑ring‑down | | V | Applications & emerging trends | Trace gas sensing, LIDAR, quantum information, ultrafast lasers | | Spectral Feature | Energy Scale | Typical