NEXAFS spectroscopy of conjugated polymers
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XANES
Organic field-effect transistor
A multiline absorption spectroscopy technique was investigated based on the single-line absorption spectroscopy technique. An open-path methane-detecting system was designed. An LED was used as a broadband source, and a Fabry-Perot interferometer whose transmission peaks matched the methane R-branch absorption lines was used to enhance the detectable sensitivity. We demonstrate a minimum-detectable concentration of 7600 +/- 10% ppm (parts per million) with a multiline differential absorption spectroscopy technique and a concentration of 1000 +/- 10% ppm with a multiline wavelength modulation spectroscopy technique.
Cavity Ring-Down Spectroscopy
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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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Over the past decade, cavity ring down spectroscopy has emerged as a powerful technique for performing direct absorption measurements using pulsed lasers. Cavity ring down spectroscopy has since been used from the ultraviolet to the mid-infrared. It is a direct absorption technique, which can be performed with pulsed or continuous light sources and has a significantly higher sensitivity than obtainable in conventional absorption spectroscopy. It can be used to measure the concentration of some light-absorbing substances. Typically, the substances to be measured are in gaseous form. This technique is most widely known as cavity ring-down spectroscopy, although the alternative, but more cumbersome, cavity ring-down laser absorption spectroscopy is preferred by some authors. Here we discuss about the experimental implementation of Cavity ring down spectroscopy 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) pre dissociation of electronically excited states of small molecules and radicals.
Cavity Ring-Down Spectroscopy
Nanosecond
Ultraviolet visible spectroscopy
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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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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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Pre-treatment of samples using selective extraction techniques may alter the chemical form of the arsenic. X-ray absorption spectroscopy is capable of providing detailed chemical and structural information about a specific absorbing element in situ with minor or no pre-treatments. There are two regimes in X-ray Absorption Structure (XAS) Spectroscopy: X-ray Absorption Near-Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) Spectroscopy. The absorption edge energy in XANES spectra is sensitive to the oxidation state of arsenic, and the position increases with an increase in oxidation state. XANES is applicable to solution or solid-phase samples and sensitive to parts per million. XANES gives chemical identity empirically by comparing sample spectra to known compounds.
XANES
X-ray absorption spectroscopy
Chemical state
X-Ray Spectroscopy
Oxidation state
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XANES
X-ray absorption spectroscopy
X-Ray Spectroscopy
K-edge
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