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Informationen zum Autor MILAN MILOSEVIC works as a consultant in the field of optical spectroscopy for MeV Technologies, LLC. Milan has spent his entire career in the field of FTIR spectroscopy, developing spectroscopic equipment and building our understanding of the physical basis of spectroscopy. He has pioneered several devices for what have become standard spectroscopic techniques, including micro ATR, variable angle ATR, and grazing angle ATR spectroscopy. Holding over fifteen US patents, Milan has authored or coauthored over thirty peer-reviewed papers on various aspects of spectroscopy. Klappentext Explains the physical principles underlying ATR spectroscopy Today, attenuated total reflection (ATR) spectroscopy is the most widely used IR spectroscopic technique. Practitioners in the field, however, are generally not very familiar with the underlying physical basis of spectroscopy, often using spectroscopy as a "black box" tool to analyze their samples. This book provides a bridge between electromagnetic theory and spectroscopy, focusing on ATR spectroscopy in particular. Readers will come to a more complete understanding of the physical phenomena underlying spectroscopic measurement and therefore be better able to make use of ATR and other spectroscopic techniques. Internal Reflection and ATR Spectroscopy is a unique contribution to the field of spectroscopy, offering derivations of the formulae frequently used in the field and examining important underlying physical mechanisms that are typically not addressed in spectroscopy texts. The book features detailed coverage of such topics as: Light propagation through absorbing materials Reflection at the interface between two media Phenomena of internal reflection and the evanescent wave Reflectance and transmittance of multi-layered samples Analysis of ATR experiments As they progress through the book, readers will discover discussions of several new phenomena, including a revision of the conventional understanding of the evanescent wave and of the transport of electromagnetic energy through a totally reflecting interface. In addition, the author identifies a new type of internal reflection that enables researchers to observe some unusual fringes. Throughout all the discussions, numerous figures aid in understanding difficult concepts. Internal Reflection and ATR Spectroscopy is recommended for all students and researchers who use ATR spectroscopy. By helping readers understand the underlying physical principles of ATR spectroscopy, the book makes it possible for them to optimize the use of spectroscopy as an analytical tool. Zusammenfassung Attenuated Total Reflection (ATR) spectroscopy is the most frequently used sampling technique for infrared spectroscopy, enabling samples to be examined in solid or liquid states. This book shows how ATR is used for materials that are either too thick or strong to be analyzed by other methods. Inhaltsverzeichnis Preface xiii 1 Introduction to Spectroscopy 1 1.1 History 1 1.2 Definition of Transmittance and Reflectance 6 1.3 The Spectroscopic Experiment and the Spectrometer 10 1.4 Propagation of Light through a Medium 13 1.5 Transmittance and Absorbance 15 1.6 S/N in a Spectroscopic Measurement 16 2 Harmonic Oscillator Model for Optical Constants 20 2.1 Harmonic Oscillator Model for Polarizability 20 2.2 Clausius-Mossotti Equation 25 2.3 Refractive Index 26 2.4 Absorption Index and Concentration 29 3 Propagation of Electromagnetic Energy 31 3.1 Poynting Vector and Flow of Electromagnetic Energy 31 3.2 Linear Momentum of Light 34 3.3 Light Absorption in Absorbing Media 35 3.4 Lambert Law and Molecular Cross Section 36 4 Fresnel Equations 39 4.1 Electromagnetic Fields ...
