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Book Chapter

IR spectroscopy as a tool for the characterisation of ceramic precursor phases

By
Anton Beran
Anton Beran
1
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstraße 14, A-1090 Wien, Austria
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Dietmar Voll
Dietmar Voll
1
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstraße 14, A-1090 Wien, Austria
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Hartmut Schneider
Hartmut Schneider
2
Deutsches Zentrum für Luft- und Raumfahrt, Institut für Werkstoff-Forschung, Porz-Wahnheide, Linder Höhe, D-51140 Köln, Germany
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Published:
January 01, 2004

Abstract

Infrared (IR) spectra originate from transitions between vibrational energy levels of vibrating atomic groups and they are usually observed as absorption spectra. Molecules, atomic groups and even the whole lattice in crystals may interact with the electromagnetic field of light and absorb part of the energy carried by the light. The molecule interacts only with light that carries the right amount of energy to promote the molecule from one discrete energy level (ground state) to another. When it happens that IR radiation can be absorbed and a ground state molecule can be promoted to its first excited vibrational state, we say that the molecule has made a transition between the ground state and the excited state. Light of IR frequencies can generally excite molecules or functional atomic groups from one vibrational energy level to another. Hence, IR spectroscopy is called “vibrational spectroscopy”. Visible and UV radiation are higher energetic and can promote the redistribution of electrons in a molecule or atomic group, such that the electronic potential energy of the molecule is changed (“electronic spectroscopy”).

Theoretical background
Bohr’s frequency condition

Using the terminology of quantum mechanics, we have to state that if a molecule is placed in an electromagnetic field (IR light), a transfer of energy from the field to the molecule will occur only when Bohr’s frequency condition is satisfied:

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Contents

European Mineralogical Union Notes in Mineralogy

Spectroscopic methods in mineralogy

Anton Beran
Anton Beran
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Eugen Libowitzky
Eugen Libowitzky
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Mineralogical Society of Great Britain and Ireland
Volume
6
ISBN electronic:
9780903056519
Publication date:
January 01, 2004

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