Absorption spectroscop

Szanyi J, Kuhn W K and Goodman D W 1994 CO oxidation on palladium 2. A combined kinetic-infrared reflection absorption spectroscopic study of Pd(IOO) J. Phys. Chem. 98 2978... 

Heesemann J 1980 Studies on monolayers 1. Surface tension and absorption spectroscopic measurements of monolayers of surface-active azo and stilbene dyes J. Am. Chem. See. 102 2167-76... 

Finally, analytical methods can be compared in terms of their need for equipment, the time required to complete an analysis, and the cost per sample. Methods relying on instrumentation are equipment-intensive and may require significant operator training. For example, the graphite furnace atomic absorption spectroscopic method for determining lead levels in water requires a significant capital investment in the instrument and an experienced operator to obtain reliable results. Other methods, such as titrimetry, require only simple equipment and reagents and can be learned quickly. 

X-ray Photoelectron and X-ray Absorption Spectroscopic Characterization of Cobalt Catalysts... 

Westermark, G. and Persson, 1. (1998) Chemisorption of tertiary phosphines on coinage and platinum group metal powders. An infrared reflectance absorption spectroscopic, enhanced Raman spectroscopic and surface coverage study. Colloids and Surfaces A -Physicochemical and Engineering Aspects, 144, 149-166. 

Hoshi N, Bae IT, Scherson DA. 2000. In situ infrared reflection absorption spectroscopic studies of coadsorption of CO with underpotential-deposited lead on Pt(lll) in an aqueous acidic solution. J Phys Chem B 104 6049-6052. 

Kwok W-M, Ma C, Phillips DL (2006) Femtosecond time- and wavelength-resolved fluorescence and absorption spectroscopic study of the excited states of adenosine and an adenine oligomer. J Am Chem Soc 128 11894-11905... 

Salares VR, Young NM, Carey PR, and Bernstein HJ. 1977. Excited-state (exciton) interactions in polyene aggregates—Resonance Raman and absorption spectroscopic evidence. Journal of Raman Spectroscopy 6(6) 282-288. 

Another method to detect energy transfer directly is to measure the concentration or amount of acceptor that has undergone an excited state reaction by means other than detecting its fluorescence. For instance, by chemical analysis or chromatographic analysis of the product of a reaction involving excited A [117, 118]. An early application of this determined the photolyzed A molecules by absorption spectroscopic analysis. [119-121], This can be a powerful method, because it does not depend on expensive instrumentation however, it lacks real-time observation, and requires subsequent manipulation. For this reason, fluorescence is the usual method of detection of the sensitized excitation of the acceptor. If it is possible to excite the donor without exciting the acceptor, then the rate of photolysis of the acceptor (which is an excited state reaction) can be used to calculate the FRET efficiency [122],... 

A still more complicated reaction is the chemiluminescent oxidation of sodium hydrogen sulfide, cysteine, and gluthathione by oxygen in the presence of heavy metal catalysts, especially copper ions 60>. When copper is used in the form of the tetrammin complex Cu(NH3) +, the chemiluminescence is due to excited-singlet oxygen when the catalyst is copper flavin mononucleotide (Cu—FMN), additional emission occurs from excited flavin mononucleotide. From absorption spectroscopic measurements J. Stauff and F. Nimmerfall60> concluded that the first reaction step consists in the addition of oxygen to the copper complex ... 

Hodge et al. [92] have described an atomic absorption spectroscopic method for the determination of butyltin chlorides and inorganic tin in natural waters, coastal sediments, and macro algae in amounts down to 0.4 ng. 

Historically, one of the most important uses of DTA analysis has been in the study of interactions between compounds. In an early study, the formation of 1 2 association complexes between lauryl or myristyl alcohols with sodium lauryl or sodium myristyl sulfates have been established [21]. In a lesson to all who use methods of thermal analysis for such work, the results were confirmed using X-ray diffraction and infrared absorption spectroscopic characterizations of the products. 

Brown Jr., G. E., G. A. Parks, and C. J. Chisholm-Brause (1989), "In-Situ X-Ray Absorption Spectroscopic Studies of Ions at Oxide-Water Interfaces", Chimia43, 248-256. 

How do the following three types of interferences affect the atomic absorption spectroscopic methods ... 

The response function and the associated analytical merits for absorption spectroscopic techniques (e.g., NIR, UV-vis and infrared) are determined by the optical path length, detector gain, signal averaging and spectral resolution. The LIF detection performance is also governed by these parameters but is also influenced by critical parameters associated with the excitation source (e.g., optical power, pulse rate, etc.) as previously discussed. ... 

Studies on the effect of pH on peroxidase catalysis, or the heme-linked ionization, have provided much information on peroxidase catalysis and the active site structure. Heme-linked ionization has been observed in kinetic, electrochemical, absorption spectroscopic, proton balance, and Raman spectroscopic studies. Kinetic studies show that compound I formation is base-catalyzed (72). The pKa values are in the range of 3 to 6. The reactions of compounds I and II with substrates are also pH-dependent with pKa values in a similar range (72). Ligand binding (e.g. CO, O2 or halide ions) to ferrous and ferric peroxidases is also pH-dependent. A wide range of pKa values has been reported (72). The redox potentials of Fe3+/Fe2+ couples for peroxidases measured so far are all affected by pH. The pKa values are between 6 and 8, indicative of an imidazole group of a histidine residue (6, 31-33),... 

C. Milsmann, A. Levina, H. H. Harris, G. J. Foran, P. Turner, and P. A. Lay, Charge distribution in chromium and vanadium catecholato complexes X-ray absorption spectroscopic and computational studies, Inorg. Chem., 45 (2006) 4743 -754. 

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