Download or read book Development and Application of Evanescent Wave Cavity Ring down Spectroscopy as a Probe of Biologically Relevant Interfaces written by Hayley Victoria Powell and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Cavity Ring Down Spectroscopy to Liquid Samples written by and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three main strategies in the application of CRDS to liquids have been investigated. In the direct liquid approach, an enclosed cavity is entirely filled with liquid for the purpose of quantifying low concentrations of solutes in a bulk solution and monitoring reactions in solution. A picomolar detection limit for a strongly absorbing solute in acetonitrile has been demonstrated, and interesting kinetic behavior has been observed at low concentrations. In the Brewster's angle flow cell implementation, a specially designed sample cell is placed within an optical cavity and used to detect low concentration species in small volume aqueous samples either statically or in a flow. It has been successfully coupled to liquid chromatography and promises to surpass commercial UV-Vis detectors in sensitivity. In evanescent wave CRDS, a prism is placed within the optical cavity such that light undergoes total internal reflection within the prism, and the resulting evanescent wave is employed to probe optical absorption at the glass-water interface. This technique has been used to investigate cation adsorption to the interface and may have applications as an ultrasensitive detector of anionic surfactants.
Download or read book Evanescent wave Cavity Ring down Spectroscopy Applied to Condensed phase Systems written by Theresa Ellen Hannon and published by . This book was released on 2005 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavity ringdown Spectroscopy written by Kenneth W. Busch and published by . This book was released on 1999 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavity-ringdown spectroscopy is an emerging method for making high sensitivity absorption measurements with gas-phase samples. This volume, the first devoted to the method, covers the history, theory, and numerous applications. Written by leaders in the field, it is a comprehensive guide to current methods and ongoing research.
Download or read book Development and Application of Four wave Mixing and Cavity Ring down Technique for Spectroscopic Studies written by Elena Achkasova and published by . This book was released on 2007 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2007 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavity Ring Down Spectroscopy for Atmospheric Applications written by Mario Bitter and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book From Pulsed to Continuous Wave Cavity Ring down Spectroscopy written by Barbara A. Paldus and published by . This book was released on 1998 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavity Ring down Spectroscopy of Astrophysically Relevant Molecular Species Toward Quantitative and High Resolution Studies Using Spectro temporal Properties of High Finesse Cavities written by Viet Tiep Phung and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this PhD was to develop spectroscopic techniques using high finesse optical cavities. These were applied to the measurement of quantitative spectroscopic data for neutral, radical and ionic molecular species of astrophysical interest in the near infrared and visible spectral range. The first part was devoted to the measurement of the oscillator strength of high vibrational overtone bands of the cyanoacetylene (HC3N) molecule with the Cavity Ring Down Spectroscopy (CRDS) technique. The second part was devoted to the study of the spectroscopy of transient neutral and ionic species. For that, an inductively radio frequency (RF) discharged has been coupled to the CRDS set up. The pertinence of this plasma to efficiently produce anions was demonstrated via the quantitative measurement of the C2 / C2− ratio in a wide variety of conditions. A quantitative spectral analysis of the radical isotopomers 14NH2 and 15NH2 was also performed for the first time. This study provides experimental data that will allow to better constraint the 15N/14N isotopic ratio in comets through the emission lines of these two amino bearing isotopomers. The third and last part of the work was devoted to the development of a CRDS scheme called Broad Band Dual Etalon Frequency Comb Ring Down Spectroscopy. This new heterodyne technique, based on the use of the microsecond frequency combs generated by two high finesse optical cavities, should allow performing molecular spectroscopy with ultrahigh spectral resolution. First proof experiments were performed and perspective's for improvement of the method is provided.
Download or read book Development of a Cw cavity Ring Down Spectrometer and Electronic Spectroscopy of Transient Species written by A. Petre Bîrză and published by . This book was released on 2004 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of Cavity Ringdown Spectroscopy as a Sensitive Continuous Emission Monitor for Metals written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this study is to evaluate cavity ringdown spectroscopy (CRDS) as an ultrasensitive technique for trace analysis of metals. Potential applications of CRDS to meet stated Department of Energy needs include: Mercury Continuous Emission Monitor Multi-Metal Emissions Monitor Radionuclide Detector and Monitor A full description of the technique can be found in Ref. 1. Briefly, CRDS is based upon the measurement of the rate of light absorption in a closed optical cavity. PMT Cavity Mirror Sample Cavity Mirror Laser Pulse A laser pulse is injected into a stable optical cavity through one of the cavity mirrors. This light pulse is trapped between the mirror surfaces and decays exponentially over time at a rate determined by the round trip losses within the cavity. When used for trace analysis, the primary loss mechanisms governing the decay time are mirror reflectivity losses, atomic absorption from the sample, and Rayleigh scattering from air in the cavity. The decay time is given by t = d c 1- R () +als + bd (1) where d is the cavity length, R is the reflectivity of the cavity mirrors, a is the familiar Beer's Law absorption coefficient of a sample in the cavity, ls is the length of the optical path through the sample (i.e., approximately the graphite furnace length), b is the wavelength-dependent Rayleigh scattering attenuation coefficient, and c is the speed of light. Thus, variations in a caused by changes in the sample concentration are reflected in the ringdown time. As the sample concentration increases (i.e., a increases), the ringdown time decreases yielding an absolute measurement for a. With the use of suitable mirrors, it is possible to achieve thousands of passes through the sample. This results in an effective path length reaching into the kilometers and a corresponding increase in sensitivity. An additional benefit is that it is not subject to collisional 2 quenching and the branching that occur in techniques such as laser-excited atomic fluorescence (LEAFS).
Download or read book The Development of Cavity Ringdown Spectroscopy as a Toxic Metal Continuous Emission Monitor written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Innovative program to explore the viability of using Cavity Ringdown Spectroscopy (CRDS) for trace analysis and monitoring of remediation processes for hazardous and radioactive wastes. Cavity ringdown spectroscopy is a measurement of the rate of absorption of a sample within a closed optical cavity rather than the standard measurement of the avsorved signal strength over a given sample path. It is a technique capable of providing ultra-sensitive absorption measurements in hostile environments using commercially available easy-to-use pulsed lasers. The inherent high sensitivity stems from both the long effective sample pathlengths possible and the relaxed constraints on the accuracy of the measurement of the cavity decay time.
Download or read book Atmospheric Applications of Broadband Cavity Ringdown Spectroscopy written by Alexander James Leonard Shillings and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development Characterization and Application of Biological Spectroscopic Probes written by Jeffrey Michael Rodgers and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Protein and nucleic acid molecules exhibit a range of motions that occur on various time scales and distances including large conformational changes involved in the formation of folded structures and local rearrangements where intramolecular and/or intermolecular interactions confer biological function. Because of their unique advantages, spectroscopic techniques based on measurement of molecular vibrations and fluorescence emissions have played a key role in studying the structure-dynamics-function relationship of biological molecules. However, intrinsic spectroscopic signals of this kind often lack the desired localization to interrogate a particular region or interaction of interest. Recently, small spectroscopic probe molecules which are sensitive to their local environment have become increasingly popular to investigate biological processes in a site-specific manner. Furthermore, relatively minor alterations to such molecules--including isotopic substitution and the position or identity of functional groups--can have a profound effect on their spectroscopic properties and, by extension, their usefulness. In this thesis, we investigate a number of biologically-relevant infrared probes and their variants in order to further expand their utility; we also implement fluorescence spectroscopic techniques to investigate a putative inhibitor of amyloid aggregation. First, using a set of four isotopomers of the unnatural amino acid p-cyano-phenylalanine, we show that a small change in the reduced mass of the nitrile oscillator has significant effects on both the infrared absorption frequency and the vibrational relaxation process. This characterization improves their value as very similar yet non-degenerate vibrational labels which can be introduced at multiple locations simultaneously while maintaining site-specificity and allowing for energy transfer or coupling experiments. Second, we harness the phenomenon of Fermi resonance in the infrared probe molecules 4-cyanoindole and cyclopentanone as a convenient indicator of hydrogen-bonding status of the nitrile and carbonyl functional groups. Furthermore, we investigate the dependence of the NO stretching vibrations of N-methyl-5-nitroindole on solvent polarity; this model molecule exhibits potential as an infrared probe of hydration in nucleic acids when implemented as an unnatural but universal base. Finally, we apply several spectroscopic techniques including fluorescence correlation spectroscopy to study a common neurological amino acid and its ability to prevent and disrupt the aggregation of amyloid-beta.
Download or read book Development of Infrared Evanescent Wave Fibre Sensors Using an FTIR Spectrometer written by Kieran O'Dwyer and published by . This book was released on 1993 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavity Ring Down Spectroscopy written by Giel Berden and published by John Wiley & Sons. This book was released on 2009-08-11 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavity Ring-Down Spectroscopy: Techniques and Applications provides a practical overview of this valuable analytical tool, explaining the fundamental concepts and experimental methods, and illustrating important applications. Designed as both an introductory text and a reference source, this book is relevant for scientists unfamiliar with CRDS who are interested in using the technique in their research, as well as experienced users.
Download or read book Plasmonics Fundamentals and Applications written by Stefan Alexander Maier and published by Springer Science & Business Media. This book was released on 2007-05-16 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considered a major field of photonics, plasmonics offers the potential to confine and guide light below the diffraction limit and promises a new generation of highly miniaturized photonic devices. This book combines a comprehensive introduction with an extensive overview of the current state of the art. Coverage includes plasmon waveguides, cavities for field-enhancement, nonlinear processes and the emerging field of active plasmonics studying interactions of surface plasmons with active media.
