X‐Ray Absorption Near Edge Spectroscopy
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Absorption edge
Optical absorption edges of mixed Zn1-xFexSe have been measured under hydrostatic pressure for x=0.01, 0.04 and 0.05. The authors found that absorption of ZnFeSe crystals can be considered as a sum of two components: the fundamental absorption edge, and absorption related to presence of iron. This second component weakly depends on pressure and temperature. They suggest that this extra absorption can be assigned to the charge transfer Fe2+ to Fe1+ or Fe2+ to Fe3+.
Absorption edge
Hydrostatic pressure
Hydrostatic equilibrium
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Optical absorption measurements were made on single crystals of CdI 2 , in the region near the absorption edge. The intrinsic absorption edge of Cdl 2 is dominated by the well-defined structures due to indirect excitonic absorption below 30 K. With raising the temperature, these structures are smeared out into an exponential absorption tail with relatively large steepness. Another exponential component with small steepness appears on the low energy side above 100 K and grows up to surpass the former above 130 K. Absorption measurements were also made on very thin crystals. A prominent peak and a shoulder were found at 3.693 and 3.80 eV. The small steepness component is considered as the low energy tail of the 3.693 eV absorption band. Discussions are made on the excitonic states responsible for these absorption structures and tails as well as on the exciton relaxation in the CdI 2 crystal.
Absorption edge
Crystal (programming language)
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This report is the 17th in a series on spectrochemical methods of analysis issued by IUPAC Commission V.4. It is concerned with the principles of laser absorption spectroscopy and its application in the optical wavelength region. The present report has four main sections: fundamentals of laser absorption spectroscopy, Doppler-limited spectroscopy, sub-Doppler laser spectroscopy, and time-resolved laser spectroscopy.
Molecular spectroscopy
Instrumental chemistry
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Cavity Ring-Down Spectroscopy
Optical cavity
Instrumental chemistry
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This report is the 17th in a series on spectrochemical methods of analysis issued by IUPAC Commission V.4. It is concerned with the principles of laser absorption spectroscopy and its application in the optical wavelength region. The present report has four main sections: fundamentals of laser absorption spectroscopy, Doppler-limited spectroscopy, sub-Doppler laser spectroscopy, and time-resolved laser spectroscopy.
Instrumental chemistry
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We have used frequency modulated quantum cascade lasers to make sensitive absorption spectroscopy detection of H20 and NO vapors at low pressure and low concentration. 5µ and 8µ lasers show excellent properties for sensitive spectroscopy.
Quantum cascade laser
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The structure and optical absorption property of TiO2-doped Vycor glasses are studied. The experimental results indicate that the optical absorption of the glasses are determined by anatase microcrystals in the glasses. The absorption edge shifts to long (or short) wavelength with increasing (or decreasing) of the microcrystal size. Anatase microcrystal of diameter about 80 ? shows the same absorption edge as that of bulk crystal.
Absorption edge
Crystal (programming language)
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Cavity ring-down spectroscopy (CRDS) is a laser-based absorption spectroscopy technique that is starting to find extensive application as a consequence of the very high sensitivity of the method compared with more traditional absorption spectroscopy techniques. We describe the experimental implementation of CRDS and its application to a number of areas of research including laser diagnostics of hostile environments, reaction kinetics and spectroscopy, with particular emphasis on our ongoing studies of the fast (sub-nanosecond) predissociation of electronically excited states of small molecules and radicals.
Cavity Ring-Down Spectroscopy
Nanosecond
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Absorption edge
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