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Spectroscopy is the study of electromagnetic radiation and its interaction with solid, liquid, gas and plasma. It is one of the widely used analytical techniques to study the structure of atoms and molecules. The technique is also employed to obtain information about atoms and molecules as a result of their distinctive spectra. The fast-spreading field of spectroscopic applications has made a noteworthy influence on many disciplines, including energy research, chemical processing, environmental protection and medicine. This book aims to introduce students to the topic of spectroscopy. The author has avoided the mathematical aspects of the subject as far as possible; they appear in the text only when inevitable. Including topics such as time-dependent perturbation theory, laser action and applications of Group Theory in interpretation of spectra, the book offers a detailed coverage of the basic concepts and applications of spectroscopy.

Atomic spectroscopy. --- Molecular spectroscopy.

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DFT methods are widely used in a broad range of disciplines to investigate many body systems. This book provides an overview on contemporary applications of the Density Functional Theory in various fields as computational chemistry, physics or engineering.

Density wave theory.

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Pure sciences. Natural sciences (general)