Gotowe bibliografie tematyczne / OH Stretch Vibrations

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  1. Artykuły w czasopismach
  2. Rozprawy doktorskie
  3. Streszczenia konferencji

Gotowa bibliografia na temat „OH Stretch Vibrations”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "OH Stretch Vibrations"

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Maksyutenko, Pavlo, Maxim Grechko, Thomas R. Rizzo i Oleg V. Boyarkin. "State-resolved spectroscopy of high vibrational levels of water up to the dissociative continuum". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, nr 1968 (13.06.2012): 2710–27. http://dx.doi.org/10.1098/rsta.2011.0277.

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We summarize here our experimental studies of the high rovibrational energy levels of water. The use of double-resonance vibrational overtone excitation followed by energy-selective photofragmentation and laser-induced fluorescence detection of OH fragments allowed us to measure previously inaccessible rovibrational energies above the seventh OH-stretch overtone. Extension of the experimental approach to triple-resonance excitation provides access to rovibrational levels via transitions with significant transition dipole moments (mainly OH-stretch overtones) up to the dissociation threshold of the O–H bond. A collisionally assisted excitation scheme enables us to probe vibrations that are not readily accessible via pure laser excitation. Observation of the continuous absorption onset yields a precise value for the O–H bond dissociation threshold, 41 145.94 ± 0.15 cm −1 . Finally, we detect long-lived resonances as sharp peaks in spectra above the dissociation threshold.
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Sofronov, Oleksandr O., i Huib J. Bakker. "Nature of hydrated proton vibrations revealed by nonlinear spectroscopy of acid water nanodroplets". Physical Chemistry Chemical Physics 22, nr 37 (2020): 21334–39. http://dx.doi.org/10.1039/d0cp03137b.

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Fischer, Wolfgang B., Hans H. Eysel, Ole F. Nielsen i John E. Bertie. "Corrections to the Baseline Distortions in the OH-Stretch Region of Aqueous Solutions". Applied Spectroscopy 48, nr 1 (styczeń 1994): 107–12. http://dx.doi.org/10.1366/0003702944027525.

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The intensity gains or intensity losses of the OH-stretch vibrations and their changes of band shapes as observed in IR or Raman spectra of dilute aqueous solutions of carboxylic acids, amino acids, and amines were able to be simulated. The difference spectra of the type {sample solution} – {standard} x {empirical factor} displayed essentially flat baselines throughout the OH-stretch region of isotropic Raman scattering. Peaks of the solute spectra which had been hidden by the OH-stretch contour emerged from the background. At concentrations below 1 M, pure water was the standard. Distortions of the isotropic Raman spectra at higher solute concentrations (1 M to 4 M) could be mimicked by phosphoric acid or sulfuric acid solutions as standards. The influence of solutes on the reorientational motions of water molecules made baseline corrections of anisotropic Raman scattering and IR absorption of the more concentrated solutions difficult, if not impossible.
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Athokpam, Bijyalaxmi, Sai G. Ramesh i Ross H. McKenzie. "Effect of hydrogen bonding on the infrared absorption intensity of OH stretch vibrations". Chemical Physics 488-489 (maj 2017): 43–54. http://dx.doi.org/10.1016/j.chemphys.2017.03.006.

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Saliu, Oluwaseyi D., Gabriel A. Olatunji, Azeh Yakubu, Mariam T. Arowona i Aminat A. Mohammed. "Catalytic crosslinking of a regenerated hydrophobic benzylated cellulose and nano TiO2 composite for enhanced oil absorbency". e-Polymers 17, nr 4 (27.06.2017): 295–302. http://dx.doi.org/10.1515/epoly-2016-0289.

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AbstractHydrophobic cellulosic composites with the nano form of metal oxides possess good absorptive and adsorptive potentials. Native cellulose was regenerated, benzylated, crosslinked and blended with TiO2 nanoparticles to absorb toluene, xylene, chloroform, kerosene and petrol. The composite was fully characterized by scanning electron microscopy (SEM), transmission emission microscopy (TEM), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The effect of crosslinker, catalyst and time of absorption was investigated. The FTIR shows stretch and bend vibrations of hydroxyl (-OH), alkyl (-CH), aromatic double bond (C=C) for benzyl cellulose while the appearance of new peaks at 816, 769 and 726 cm−1 for Ti-O stretching vibrations confirms the successful synthesis of the composite. The SEM images revealed the transformation of foam-like appearance of benzyl cellulose to a solidified mass after TiO2 compositing. Enhanced oil absorption was seen as the amount of the aluminum sulfate catalyst was doubled as a high Qmax of 24.16, 25.81, 27.22, 24.03 and 24.43 was obtained when the amount of catalyst used was doubled.
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Fu, H. B., Y. J. Hu i E. R. Bernstein. "IR+vacuum ultraviolet (118 nm) nonresonant ionization spectroscopy of methanol monomers and clusters: Neutral cluster distribution and size-specific detection of the OH stretch vibrations". Journal of Chemical Physics 124, nr 2 (14.01.2006): 024302. http://dx.doi.org/10.1063/1.2141951.

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Pato, Usman, Yusmarini, Emma Riftyan, Evy Rossi, Rahmad Hidayat, Sandra Fitri Anjani, Nabila Riadi, Ika Nur Octaviani, Agrina Syahrul i Daimon Syukri. "Physicochemical characteristics of oil palm frond and application of CMF Hydrogel as a natural encapsulant for probiotic". IOP Conference Series: Earth and Environmental Science 1228, nr 1 (1.08.2023): 012002. http://dx.doi.org/10.1088/1755-1315/1228/1/012002.

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Abstract Oil palm solid waste from Indonesia’s large oil palm plantations has enormous potential to meet various human needs. Lb. fermentum InaCC B 1295 (LFB1295) was tested in vitro for viability, acid and bile tolerance, safety assessment, and antioxidant activities as a potential probiotic. The physiochemical characteristics of oil palm frond (OPF) and cellulose microfiber (CMF) were also examined. OPF mainly consisted of carbohydrates, particularly fiber, followed by ash, protein, and fat. The major components of OPF fiber were cellulose, lignin, and hemicellulose. The crystal index of the cellulose from OPF was 93.4%, according to an X-ray diffraction examination. The vibrations that stretch the cellulose’s -OH group were discovered via FTIR analysis at 3420.05 cm-1. The viability of LFB1295 was maintained at 9.99 log CFU/g by CMF from OPF. The persistence of LFB1295 under bile-containing conditions and at low pH was characterized by a decrease in cell number at 2.03 and 1.56 log CFU/mL, respectively. Based on its ability to repel hydrogen peroxide, neutralize DPPH radicals, and actively neutralize hydroxyl radicals. LFB1295, encapsulated in CMF hydrogel of OPF, has good antioxidant characteristics. This fact is demonstrated by the value of Hydroxyl radical scavenging activity, which is 78.43%, and the capacity to scavenge DPPH radicals, which has an inhibition and IC50 of 47.28%. Encapsulated LFB1295 by CMF hydrogel from OPF passed all in vitro safety tests.
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Rozhkov, Sergey, Andrey Goryunov, Vladimir Kolodey, Lyubov Pron’kina i Natalia Rozhkova. "The Role of Water Hydrogen Bonds in the Formation of Associates and Condensates in Dispersions of Serum Albumin with Shungite Carbon and Quartz Nanoparticles". Coatings 13, nr 2 (19.02.2023): 471. http://dx.doi.org/10.3390/coatings13020471.

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The role of the network of water hydrogen bonds in the regulation of the intermolecular interaction’s responsible for colloidal stability of dispersions has been studied in order to search for general patterns of interaction between water, nanoparticles, and bio-macromolecules. Raman spectroscopy for mixed dispersions of bovine serum albumin (SA), shungite carbon nanoparticles (ShC NPs), and quartz nanoparticles (quartz NPs) was performed within the wave number range 3200–3600 cm−1. The main spectral lines in this range are caused by the OH stretch vibrations of water molecules. We analyzed the state of the water hydrogen bonding network for dispersions of varied ratios of both fatty acid-containing and fatty acid-free SA macromolecules, ShC NPs, and silica NPs in the range 0.01–10 mg/mL.We used dynamic light scattering to control the sizes of the protein associates and protein associates with ShC NPs and quartz NPs. The strength of the hydrogen bonds in water depends essentially non-linearly, but in a qualitatively similar way, on the concentrations of the dispersion components. The initial strengthening of the bonds is followed by their loosening with a further increase in the concentration of the components. This is accompanied by the association of the dispersion components. We estimate the thickness of the protein corona layer as 20–25 nm for ShC NPs and 28–33 nm for quartz NPs, depending on the SA concentration. Colloidal stability of the aqueous dispersion is determined almost completely by an association of the protein with NPs. In contrast, colloidal stability of a pure protein solution is regulated by the formation of protein clusters of two main types and sizes. The association effects of SA with ShC NPs are evident in microscopic images of condensate films. The structures differ significantly for native and fatty acid-free SA in shape and size.
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Fry, Juliane L., Jamie Matthews, Joseph R. Lane, Coleen M. Roehl, Amitabha Sinha, Henrik G. Kjaergaard i Paul O. Wennberg. "OH-Stretch Vibrational Spectroscopy of Hydroxymethyl Hydroperoxide". Journal of Physical Chemistry A 110, nr 22 (czerwiec 2006): 7072–79. http://dx.doi.org/10.1021/jp0612127.

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Staib, Arnulf, i James T. Hynes. "Vibrational predissociation in hydrogen-bonded OH…O complexes via OH stretch-OO stretch energy transfer". Chemical Physics Letters 204, nr 1-2 (marzec 1993): 197–205. http://dx.doi.org/10.1016/0009-2614(93)85627-z.

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Rozprawy doktorskie na temat "OH Stretch Vibrations"

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Dzugan, Laura C. "Theoretical Treatments of the Effects of Low Frequency Vibrations on OH Stretches in Molecules and Ion-Water Complexes that Undergo Large Amplitude Motions". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492688748608717.

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Twagirayezu, Sylvestre. "Vibrational Relaxation Pathways and Torsional Large Amplitude Motion Studies in the CH-Stretch Region of CH3OH and CH3OD". University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1311720280.

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Premont-Schwarz, Mirabelle. "Elementary solute-solvent interactions and the photophysical properties of photoacids". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16792.

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Photosäuren sind aromatische Alkohole, sogenannt aufgrund der Erhöhung ihrer Azidität, die aus der elektronischen Anregung folgt. Allerdings muss ein plausibles Verständnis der Prozesse, die zu der Erhöhung der Azidität führen noch etabliert werden. Zu diesem Zweck wird die Photophysik zweier Photosäuren, 1-Naphthol (1N) und 2-Naphthol (2N), untersucht. Mit Hilfe der Femtosekunden-UV-Anrege/IR-Abtast-Spektroskopie wird die OH-Streckschwingung sowohl im Grundzustand als auch im angeregten Zustand gemessen. Die intrinsische elektronische Ladungsverteilung, die aufgrund der Anregung in der Säure auftritt, in apolaren Lösungsmitteln untersucht. Der Vergleich mit Resultaten eines theoretischen Modells stellte einwandfrei fest, dass eine geringe Ladungsverteilung in der Photosäure auftritt. Die OH-Streckschwingung von wasserstoffverbrückten Komplexen zwischen 2N und Acetonitril wird gemessen. Obwohl experimentell gefunden wurde, dass der angeregte Zustand verglichen mit dem Grundzustand eine nahezu doppelt so große solvatochromatische Verschiebung zeigt, scheitern theoretische Modelle daran, diese Ergebnisse wiederzugeben. Die Ladungstransferreaktion im angeregten Zustand von 1N und 2N zu halogenierten Lösungsmitteln wird zur Abfrage der elektronischen Dichte am aromatischen Ring nach Anregung verwendet. Wurde ermittelt, dass verglichen mit dem unkomplexierten Molekül die Elektrontransferrate in einem wasserstoffverbrückten Komplex mit Acetonitril 10 mal höher ist. Auf diese Weise hat sich der Einfluss der Wasserstoffbrückenbindung auf das Ausmaß der Ladungsverteilung gezeigt. Mittels zeitaufgelöster Anisotropie, Fluoreszenz und IR-Messungen war es möglich festzustellen, dass die ultraschnelle (
Photoacids are aromatic alcohols, characterized by a dramatic increase in acidity upon electronic excitation. A coherent view of the processes giving rise to this increase in acidity has yet to be established. To this effect, the photophysics of photoacids 1-naphthol (1N) and 2-naphthol (2N) are investigated. Using femtosecond UV pump-IR probe spectroscopy, the OH stretch vibration in both the ground and excited-state is measured. The intrinsic electronic charge redistribution in the acid upon excitation is investigated in non-polar solvents where specific interactions are absent. Comparison with results from a theoretical model based on the Pullin-van der Zwan-Hynes perturbative approach established that little charge redistribution occurs in the photoacid. The OH stretch vibration of hydrogen-bonded complexes of 2N with acetonitrile is measured. While it was found experimentally that the excited-state is characterized by a solvatochromic response that is almost twice as large as in the ground-state, the theoretical model failed to reproduce these results. Instead, the calculations predict no significant differences between the behaviour of the two states. The excited-state charge transfer reaction of 1N and 2N to halogenated solvents is used as a probe for the electronic density on the aromatic ring upon excitation. The charge transfer rate for the hydrogen-bonded complex with acetonitrile is found to be ten times higher than for the uncomplexed molecule. In this way, the influence of a hydrogen-bond on the extent of charge redistribution was evinced. Using time resolved anisotropy, fluorescence and IR measurements, it was determined that ultrafast (
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Bräuer, Andreas, Robert Fabian Hankel, Markus Konstantin Mehnert, Julian Jonathan Schuster i Stefan Will. "A Raman technique applicable for the analysis of the working principle of promoters and inhibitors of gas hydrate formation". 2015. https://tubaf.qucosa.de/id/qucosa%3A71501.

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We report a Raman technique applicable for the in situ analysis of the development of hydrogen bonds in the liquid water‐rich phase just before the onset of gas hydrate formation. Herewith, the phase transition as well as the working principle of hydrate formation inhibitors and promoters can be analyzed.
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Streszczenia konferencji na temat "OH Stretch Vibrations"

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Sibert, Edwin. "THEORETICAL DESCRIPTIONS OF THE FUNDAMENTALS OF CH, NH AND OH STRETCH VIBRATIONS WITH SIMPLE MODELS THAT INCLUDE ANHARMONIC EFFECTS". W 2022 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2022. http://dx.doi.org/10.15278/isms.2022.ma01.

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Lester, Marsha I. "Reaction dynamics of the OH–Ar complex". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.wc2.

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Recent experiments performed in this laboratory have provided a detailed picture of the intermolecular potential between the open-shell hydroxyl radical and an argon atom. The interaction potentials between Ar (1S0) and OH in the ground X 2 II 3 2 and excited A 2Σ+ electronic states have been probed through spectroscopic measurements and half-collision studies of the weakly bound OH-Arvan der Waals (vdW) complex. Vibrational excitation of the OH subunit induces dissociation of the complex, providing a means to examine the dynamics taking place on these potential energy surfaces. Our results show striking differences, in both the potentials and dynamics, between the ground and excited electronic states. The rate of dissociation is at least five orders of magnitude slower in the ground electronic state than in the excited state. The dissociation dynamics for OH-Ar complexes correlating with changes with initial vdW state selection. The product rotational distribution reflects the bending wave function of the complex, while the rate of dissociation depends on the number of quanta of excitation in the vdW stretching coordinate. The rate becomes faster as the excitation in the vdW stretch is decreased.
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Beckerle, J. D., M. P. Casassa, R. R. Cavanagh, E. J. Heilweil i J. C. Stephenson. "Ultrafast laser studies of vibrational relaxation on surfaces: CO (v = 1)/Pt(111)". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fa2.

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Energy transfer at surfaces is important in physical processes such as sticking, desorption, diffusion, and the chemistry of oxidation, catalysis, and electronic materials processing. Early information on rates and mechanisms of vibrational energy dissipation came from theory or were inferred from linewidths of optical spectra. We have used tunable subpicosecond IR laser pulses in pump-probe experiments to obtain time-resolved information about the vibrational energy relaxation time (T1) and homogeneous dephasing time (T2) for the high-frequency CO (v = 1) stretch mode of an ordered monolayer of CO on the surface of a Pt(111) single crystal. The observed Ti ≈ 4 ps at low temperatures is slower than would be inferred from the IR bandwidth for top-site CO. Transient IR spectra of the excited adlayer suggest that the CO (v = 1) → (v = 2) band is anharmonic- ally shifted from the fundamental v = 0 → v = 1 transition by only 4-5 cm−1. These results are compared with the long values of T for OH, NH, or SiH stretch modes on nonmetallic surfaces, and to spectral data and time-resolved studies of very fast CO-CO coupling in metal carbonyl molecules and very short T1 for CO (v = 1) chemisorbed on amorphous metal particles. These comparisons, as well as theory, suggest the important energy relaxation mechanism for CO (v = 1 )/Pt(111) is coupling of the vibrating dipole to metal free electrons, i.e., damping by electron-hole pair formation.
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Sung, Woongmo, Ken-ichi Inoue, Satoshi Nihonyanagi i Tahei Tahara. "Vibrational relaxation of water at the air/H2O interface revealed by time-resolved heterodyne-detected vibrational sum-frequency generation in the OH stretch hot-band region". W International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/up.2020.th3a.3.

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