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Showing 1 to 20 of 458 for “"Absorption spectroscopy"”.
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Hydrogen purity assessment using laser absorption Spectroscopy
… based on direct Tunable Diode Laser Absorption Spectroscopy (d-TDLAS). The goal is to establish a traceable and accurate methodology for hydrogen purity and concentration measurement without relying on calibration gases. The main objective of this research is to develop and evaluate …
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Exhaled breath analysis using laser absorption spectroscopy
… coupled with off-axis integrated cavity output spectroscopy (ICOS) was developed to simultaneously measure exhaled NO and CO2. Using the Bland-Altman method, the ICOS platform was found to be in good agreement with two commercial gas sensors---a chemiluminescent analyzer for NO and a …
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Determining Emission Factors from Marine Vessels Employing Differential Optical Absorption Spectroscopy (DOAS) and Tunable Diode Laser Absorption Spectroscopy (TDLAS)
High SO2 concentrations are harmful to human health and impact climate by affecting cloud formation. Ship contrails are the major source of SO2 in the open-ocean and impact coastal region air quality. The International Maritime Organization (IMO) regulates SO2 emissions by requiring ships to use …
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Laser absorption spectroscopy for investigation of hypersonic propulsion
… the ACT-II facility, using tunable diode laser absorption spectroscopy (TDLAS) to measure temperature and nitric oxide (NO) concentration. Another fundamental challenge associated with scramjet operation is achieving efficient fuel-air mixing and ignition within the short residence times of a …
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Chemistry Of Antiwear Films By X-ray Absorption Spectroscopy
… Among the surface techniques employed, X-ray absorption spectroscopy (including EXAFS and XANES) has been mainly used because of its high resolution, low detection limit and non-destructive characteristics.;This is the first time that P and S L-edge XANES spectroscopy has been used to analyze …
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Volcanic Gas Studies by Multi Axis Differential Absorption Spectroscopy
The chemistry of volcanic plumes can give insights into volcanic processes, which could help with improving the forecast of volcanic eruptions and is also of atmospheric relevance as the volcanic source of aerosols and trace gases can have a significant climatic impact. Although both are very …
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Kinetics and dynamics measured using IntraCavity Laser Absorption Spectroscopy
IntraCavity Laser Absorption Spectroscopy (ICLAS) is a high-resolution, high sensitivity spectroscopic method capable of measuring line positions, linewidths, lineshapes, and absolute line intensities with a sensitivity that far exceeds that of a traditional multiple pass absorption cell or Fourier …
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Computational Studies on Bimetallic Catalysis and X-ray Absorption Spectroscopy
… performed on bimetallic catalysis and on X-ray absorption spectroscopy of insulators. The viability of a bimetallic rhodium and cobalt catalysts for industrially important hydroformylation and aldehyde-water shift catalysis (AWS) is discussed. Density functional theory (DFT) studies were used …
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Transient Rydberg Absorption Spectroscopy of Electron Beam Excited Rare Gases
Transient absorption spectra of molecular and atomic Rydberg transitions in the ultraviolet, visible, and near infrared (220 (LESSTHEQ) (lamda) (LESSTHEQ) 900 nm) spectral regions have been observed in electron beam exci- ted rare gases. The most prominent molecular bands for He(,2), Ne(,2),
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X-ray absorption spectroscopy of actinide speciation in solid solutions
… to a wide range of conditions is required. X-ray absorption spectroscopy (XAS), a nondestructive technique that is ideal for determining the molecular composition of materials in dilute quantities in solution and solid forms, was used to determine the speciation of actinides in various solid …
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Structure and properties of high temperature molecules by microwave absorption spectroscopy
Contains fulltext : mmubn000001_207567794.pdf (Publisher’s version ) (Open Access)
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Time-resolved absorption spectroscopy of the rare gas dimer Rydberg states
… both through intra-cavity and multi-pass laser absorption spectroscopy.
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Nanoparticle-nanoparticle interactions and light-matter interaction studied by simulated absorption spectroscopy
… efficient tight-binding calculations, the absorption spectra of homodimer and heterodimer nanoparticles are explored. Then, plasmon-induced excitation energy transfer is simulated with an attosecond time step up to investigate processes occurring on the picosecond dynamics time scale. …
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Transient frequency modulation absorption spectroscopy as a probe of gas-liquid scattering
… dynamics via transient frequency modulated absorption spectroscopy (TFMAS). Using this technique in the near infrared (NIR), the inelastic scattering of gaseous CN(X 2Σ +) radicals from fluorinated and aliphatic liquid surfaces was found to be predominantly impulsive. These experiments also …
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Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… from the cavity was used to measure broadband absorption spectra of gaseous azulene through (i) time-dependent cavity ring-down (CRDS), and (ii) intensity-dependent incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) methodologies. Based on the broadband ring-down time of …
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Comparative Analysis and Speciation of Sulfur K, L-edge X-ray Absorption Spectroscopy
… state ranging from -2 to +6, using K-edge X-ray absorption spectroscopy is particularly useful for determining oxidized species. There are, however, limitations on the ability to visually resolve spectra for reduced and mixed sulfur compounds using the K-edge that may be better resolved using the …
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Fourier-transformed infrared absorption spectroscopy and kinetics studies of Gas phase small molecules
The work in this thesis is directed towards understanding the kinetic of elementary gas-phase reactions using laser (lamp) based infrared techniques. The small molecules are very important in the atmospheric or combustion chemistry. We studied four types of reactions. The first one is the reactions …
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