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An invaluable text for the teaching, design, and development of gas sensor technology. This excellent resource synthesizes the fundamental principles of spectroscopy, laser physics, and photonics technology and engineering to enable the reader to fully understand the key issues and apply them in the design of optical gas absorption sensors. It provides a straightforward introduction to low-cost and highly versatile near-IR systems, as well as an extensive review of mid-IR systems. Fibre laser systems for spectroscopy are also examined in detail, especially the emerging technique of frequency comb spectroscopy. Featuring many examples of real-world application and performance, as well as MATLAB computer programs for modeling and simulation, this exceptional work is ideal for postgraduate students, researchers, and professional engineers seeking to gain an in-depth understanding of the principles and applications of fibre-optic and laser-based gas sensors.

Laser spectroscopy. --- Optical spectroscopy. --- Spectroscopy, Optical --- Visible spectroscopy --- Spectrum analysis

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MICROWAVE SPECTROSCOPY --- VIBRATIONAL SPECTROSCOPY --- UV AND VISIBLE SPECTROSCOPY --- MOSSBAUER SPECTROSCOPY --- ESR (ELECTRON SPIN RESONANCE) --- MICROWAVE SPECTROSCOPY --- VIBRATIONAL SPECTROSCOPY --- UV AND VISIBLE SPECTROSCOPY --- MOSSBAUER SPECTROSCOPY --- ESR (ELECTRON SPIN RESONANCE)

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Electron configuration. --- Group theory. --- Molecular rotation. --- Nuclear magnetic resonance. --- Esr (electron spin resonance) --- Molecular vibration --- Quantum transition --- Symmetry --- Uv and visible spectroscopy --- Esr (electron spin resonance) --- Molecular vibration --- Quantum transition --- Symmetry --- Uv and visible spectroscopy

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Optical Spectroscopy bridges a gap by providing a background on optics while focusing on spectroscopic methodologies, tools and instrumentations. The book introduces the most widely used steady-state and time-resolved spectroscopic techniques, makes comparisons between them, and provides the methodology for estimating the most important characteristics of the techniques such as sensitivity and time resolution. Recent developments in lasers, optics and electronics has had a significant impact on modern optical spectroscopic methods and instrumentations. Combining the newest l

Atomic physics --- Optical spectroscopy. --- Optical instruments --- Optics --- Physical instruments --- Spectroscopy, Optical --- Visible spectroscopy --- Spectrum analysis --- Methodology. --- Instruments

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Ionic Liquids (ILs) are molten salts at room temperature (<100°C) with particular physico-chemical properties of interest for the chemical industry. They exhibit properties that classify them as green solvents, such as non-volatility. Additionally, they possess super-acidity, enabling them to replace conventional molecular solvents and paving the way for various applications like catalysis and synthesis. Given the current European legislations, such as REACH, ionic liquids were identified as an alternative to polluting volatile organic solvents. Therefore, to gain a deeper understanding of these unique solvents, particularly their super-acidic nature, this Master thesis focuses on the experimental estimation of proton solvation energy in the ionic liquid [BMIm][OTf] using Raman and UV-visible spectroscopy, employing the Hammett acidity function. The first part explores the use of different nitroanilines as pH indicators in the [BMIm][OTf] to determine the Hammett acidity function values with the gradual addition of a strong acid (HOTf). The Results indicate that the determined acidity is apparent due to the influence of basicity and the concentration of pH-reporter on the proton solvation energy, along with the formation of ion pairs in the medium. The second part of this thesis addresses initial attempts to study proton transfer from a pH-sensitive molecule adsorbed on silver-coated gold nanoparticles using surface-enhanced Raman spectroscopy (SERS) directly in [BMIm][OTf]. The use of SERS aims to mitigate the impact of interactions between pH indicators and improve acidity characterization.

Ionic liquids --- Raman spectroscopy --- Acidity --- SERS --- Nanoparticles --- UV-Visible spectroscopy --- Physique, chimie, mathématiques & sciences de la terre > Chimie