Abstract:Radiation of a cw CO2 laser can be used to excite infrared emission spectra of nearly all molecular gases by adding small amounts of SF6 as a sensitizer. These emission spectra show a thermal equilibrium between vibrational, rotational, and translational states with temperatures up to 1200 K. Temperature profiles of these gases about a focused cw CO2 laser beam are analyzed by Raman spectroscopy. The detection of small amounts of sample and investigations of cw laser-induced chemical reactions are interesting … Show more
Infrared emission spectroscopy (IRES) is concerned mainly with thermal emission of molecular systems. IRES can be applied to the analysis of a wide range of organic and inorganic substances in solid, liquid and gaseous phases, such as bulk materials, surfaces, catalysts, thin layers, etc.
The chapter discusses the basic principles and laws of thermal radiation and thermal emission of blackbodies and nonblackbodies. The spectral distortion due to self‐absorption; the influence of sample temperature, thickness, and surface reflectivity; and the role of correction for detector temperature are discussed. Basic principles of laboratory methods, instrumentation, sample preparation, and quantitative aspects are summarized.
Examples of applications of IRES in mid‐ and far‐infrared region for study of supported metal catalysts, metal powders, thin layers, and adsorbates on metal single crystals are given and the emission–absorption phenomenon are discussed in detail.
Infrared emission spectroscopy (IRES) is concerned mainly with thermal emission of molecular systems. IRES can be applied to the analysis of a wide range of organic and inorganic substances in solid, liquid and gaseous phases, such as bulk materials, surfaces, catalysts, thin layers, etc.
The chapter discusses the basic principles and laws of thermal radiation and thermal emission of blackbodies and nonblackbodies. The spectral distortion due to self‐absorption; the influence of sample temperature, thickness, and surface reflectivity; and the role of correction for detector temperature are discussed. Basic principles of laboratory methods, instrumentation, sample preparation, and quantitative aspects are summarized.
Examples of applications of IRES in mid‐ and far‐infrared region for study of supported metal catalysts, metal powders, thin layers, and adsorbates on metal single crystals are given and the emission–absorption phenomenon are discussed in detail.
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