. There is little doubt that the bulk of the organic matter in meteorites is indigenous, judging from isotopic measurements on C, H, and S (20, 21). Such proof is not available for individual compounds, however, and it is therefore necessary to resort to less direct arguments to rule out terrestrial contamination. We shall briefly review the most reliably established features of organic matter ...

CONTENTS Introduction Ultraviolet and Visible Spectroscopy Nature of Electronic Transitions Principles of Absorption Spectroscopy Spectral Measurements Solvent Effects Applications of Electron Spectroscopy Commercial Applications of UV and Visible Spectroscopy Infrared Absorption Spectroscopy Hooke’s law and Absorption of Radiations Modes of Molecular Vibrations Other Factors influencing Vibrat...