Introduction / by Dudley Williams -- Molecular spectroscopy / by David R. Lide -- Light scattering / by D.H. Rank and T.A. Wiggins -- Resonance studies / by J.D. Memory and G.W. Parker -- Mass spectrometry / by C.A. McDowell -- Molecular beam spectroscopy / by Thomas C. English and Jens C. Zorn -- Recently developed methods of investigation.