Preface to Second Edition.

Preface to Third Edition.

Preface to Fourth Edition.

Units, Dimensions and Conventions.

Fundamental Constants.

Useful Conversion Factors.

1. Some Important Results in Quantum Mechanics.

2. Electromagnetic Radiation and Its Interaction with Atoms and Molecules.

3. General Features of Experimental Methods.

4. Molecular Symmetry.

5. Rotational Spectroscopy.

6. Vibrational Spectroscopy.

7. Electronic Spectroscopy.

8. Photoelectron and Related Spectroscopies.

9. Lasers and Laser Spectroscopy.

Appendix A: Character Tables.

Appendix B: Symmetry Species of Vibrations.

Index of Atoms and Molecules.

Subject Index.