Applied Spectroscopy

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The Use of Polyethylene Disks in the Far Infrared Spectroscopy of Solids
Applied Spectroscopy - Tập 17 Số 6 - Trang 166-166 - 1963
Leopold May, Karl J. Schwing
Laser-Induced Breakdown Spectroscopy for In-Cylinder Equivalence Ratio Measurements in Laser-Ignited Natural Gas Engines
Applied Spectroscopy - Tập 63 Số 5 - Trang 549-554 - 2009
Sachin Joshi, Daniel B. Olsen, Cosmin E. Dumitrescu, Paulius V. Puzinauskas, Azer P. Yalin
In this contribution we present the first demonstration of simultaneous use of laser sparks for engine ignition and laser-induced breakdown spectroscopy (LIBS) measurements of in-cylinder equivalence ratios. A 1064 nm neodynium yttrium aluminum garnet (Nd:YAG) laser beam is used with an optical spark plug to ignite a single cylinder natural gas engine. The optical emission from the combustion init... hiện toàn bộ
Instantaneous Temperature Imaging of Diffusion Flames Using Two-Line Atomic Fluorescence
Applied Spectroscopy - Tập 64 Số 2 - Trang 173-176 - 2010
Paul R. Medwell, Qing Nian Chan, P. Kalt, Zeyad T. Alwahabi, Bassam B. Dally, Graham J. Nathan
This work investigates the first demonstration of nonlinear regime two-line atomic fluorescence (NTLAF) thermometry in laminar non-premixed flames. The results show the expediency of the technique in the study of the reaction zone and reveals interesting findings about the indium atomization process. Indium fluorescence is observed to be strongest at the flame-front, where the temperature exceeds ... hiện toàn bộ
Measurement of Small Volume Flame Temperatures by the Two-Line Atomic Fluorescence Method
Applied Spectroscopy - Tập 31 Số 2 - Trang 156-163 - 1977
Hiroki Haraguchi, Benjamin Smith, Stephan Weeks, D. J. Johnson, J. D. Winefordner
Measurement of small volume temperatures of analytical flames by the two-line atomic fluorescence technique involving the use of direct-line Stokes and anti-Stokes fluorescence of indium and thallium has been examined. Spatial flame temperatures have been measured with a volume resolution of 0.3 mm by 2 mm by 5 mm in the flame. Theoretical and practical considerations of the method are given, part... hiện toàn bộ
Molecular Structure of Nitrogen in Coal from XANES Spectroscopy
Applied Spectroscopy - Tập 47 Số 8 - Trang 1268-1275 - 1993
Oliver C. Mullins, Sudipa Mitra-Kirtley, J. van Elp, Stephen P. Cramer
Five major nitrogen chemical structures, present in coals of varying ranks, have been quantitatively determined with the use of nitrogen x-ray absorption near-edge spectroscopy (XANES). Similar studies of the sulfur chemical structures of coals have been performed for the last ten years; nitrogen studies on these fossil-fuel samples have only recently been realized. XANES spectra of coals exhibit ... hiện toàn bộ
Mid-Infrared and Near-Infrared Spectral Properties of Mycorrhizal and Non-Mycorrhizal Root Cultures
Applied Spectroscopy - Tập 63 Số 5 - Trang 494-500 - 2009
Francisco J. Calderón, Verónica Acosta‐Martínez, David D. Douds, James B. Reeves, Merle F. Vigil
We investigated the Fourier-transformed mid-infrared (MIR) and near-infrared (NIR) spectroscopic properties of mycorrhizal (M) and non-mycorrhizal (NM) carrot roots with the goal of finding infrared markers for colonization by arbuscular mycorrhizal (AM) fungi. The roots were cultured with or without the AM fungus Glomus intraradices under laboratory conditions. A total of 50 M and NM samples were... hiện toàn bộ
Non-Complexing Anions for Quantitative Speciation Studies Using Raman Spectroscopy in Fused Silica High-Pressure Optical Cells under Hydrothermal Conditions
Applied Spectroscopy - Tập 69 Số 8 - Trang 972-983 - 2015
L. Applegarth, Christopher Alcorn, Katherine Bissonette, John A. Noël, Peter R. Tremaine
This paper reports methods for obtaining time-dependent reduced isotropic Raman spectra of aqueous species in quartz capillary high-pressure optical cells under hydrothermal conditions, as a means of determining quantitative speciation in hydrothermal fluids. The methods have been used to determine relative Raman scattering coefficients and to examine the thermal decomposition kinetics of the non-... hiện toàn bộ
Fluorescence Quenching Investigation of the Complexes of Dibenzofuran with Natural Cyclodextrins
Applied Spectroscopy - Tập 56 Số 11 - Trang 1490-1497 - 2002
Pablo Baladrón Rodríguez, Miguel Sánchez, José Ramón Isasi, Gustavo González‐Gaitano
The steady-state fluorescence of dibenzofuran (DBF) in aqueous solution is quenched in the presence of natural cyclodextrins (CDs), α, β, and γ-CD. The decrease in the fluorescence is static in nature for all the macrocycles and follows as a result of the formation of inclusion complexes of dominant 1:1 stoichiometry. With γ-CD, excimer emission is detected at high CD concentrations due to the for... hiện toàn bộ
The Far Infrared Spectra of Monosubstituted Pyridines
Applied Spectroscopy - Tập 17 Số 4 - Trang 90-97 - 1963
Raymond Isaac, F. F. Bentley, Helene Sternglanz, W. C. Coburn, C. V. Stephenson, W. S. Wilcox
Infrared spectra in the cesium bromide region are presented for 43 monosubstituted pyridines. Two- and 3-substituted pyridines are characterized in this region by two relatively intense bands near 600 and 400 cm−1. No strong characteristic bands are found for 4-substituted pyridines. The vapor-phase contours of the far infrared bands of 2-fluoro- and 2-chloropyridine indicate that the 600 and 400 ... hiện toàn bộ
Infrared and Raman Spectra of Pyrazinium Halides
Applied Spectroscopy - Tập 24 Số 6 - Trang 601-605 - 1970
R. Foglizzo, A. Novák
The ir and Raman spectra of pyrazinium chloride and bromide and their ND deuterated derivatives have been obtained in the 4000–300 cm−1 range. Twenty-six fundamentals of the pyrazinium ion are identified and compared to those of the pyrazine molecule. Frequency shifts on protonation of pyrazine are discussed.
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