One step hydroxylation of benzene to phenol using N2O
... incorporate iron directly at extra-framework positions via liquid ion-exchange. In this project, a series of selective Fe-ZSM5 catalysts with different Si/Al ratios have been prepared and evaluated for selective formation of phenol. The catalyst samples were characterized (by Atomic Absorption Spect ...
... incorporate iron directly at extra-framework positions via liquid ion-exchange. In this project, a series of selective Fe-ZSM5 catalysts with different Si/Al ratios have been prepared and evaluated for selective formation of phenol. The catalyst samples were characterized (by Atomic Absorption Spect ...
Anexo I. Modelos teóricos de análisis de sistemas de valencia mixta.
... La validez del modelo de Hush (publicado a finales de los años 60)5 se limita a sistemas de valencia mixta poco acoplados electrónicamente (Clase II). De hecho, considera que los estados electrónicos del sistema se pueden aproximar mediante las funciones de onda de los centros por separado. Sin emba ...
... La validez del modelo de Hush (publicado a finales de los años 60)5 se limita a sistemas de valencia mixta poco acoplados electrónicamente (Clase II). De hecho, considera que los estados electrónicos del sistema se pueden aproximar mediante las funciones de onda de los centros por separado. Sin emba ...
Metal cluster aggregates of the composition Nbn +
... Molecules containing transition metal atoms have often proven valuable in the catalytic synthesis of numerous compounds [1-5]. Hydrocarbon adsorption and subsequent C-H bond activation are amongst the most important steps in many catalyzed reactions [6-11]. Their exact mechanism is often not underst ...
... Molecules containing transition metal atoms have often proven valuable in the catalytic synthesis of numerous compounds [1-5]. Hydrocarbon adsorption and subsequent C-H bond activation are amongst the most important steps in many catalyzed reactions [6-11]. Their exact mechanism is often not underst ...
Phonons in III-nitride thinfilms, bulk and nanowires: a closer look into
... commonly accepted today was given. InN is more difficult to grow than other IIIV nitrides such as GaN because its low dissociation temperature (≈ 630◦ C) and high equilibrium vapour pressure of nitrogen. Due to these difficulties, early InN samples were poorly crystalline and exhibited high free ele ...
... commonly accepted today was given. InN is more difficult to grow than other IIIV nitrides such as GaN because its low dissociation temperature (≈ 630◦ C) and high equilibrium vapour pressure of nitrogen. Due to these difficulties, early InN samples were poorly crystalline and exhibited high free ele ...
Scanning tunneling microscopy and spectroscopy
... exfoliation process[1, 2] by which graphene, a one-atom thick 2 dimensional (2D) crystal of Carbon atoms arranged in a honeycomb lattice [3-8], could be isolated from graphite. The isolation of graphene and the subsequent measurements which revealed its extraordinary electronic properties [9, 10] un ...
... exfoliation process[1, 2] by which graphene, a one-atom thick 2 dimensional (2D) crystal of Carbon atoms arranged in a honeycomb lattice [3-8], could be isolated from graphite. The isolation of graphene and the subsequent measurements which revealed its extraordinary electronic properties [9, 10] un ...
ZnS Core-Shell Quantum Dots
... luminescence spanning most of the visible spectrum from 470 to 625 nm. These particles are produced using a two-step synthesis that is a modification of the methods of Danek et al.16 and Hines et al.19 ZnS overcoated dots are characterized spectroscopically and structurally using a variety of techni ...
... luminescence spanning most of the visible spectrum from 470 to 625 nm. These particles are produced using a two-step synthesis that is a modification of the methods of Danek et al.16 and Hines et al.19 ZnS overcoated dots are characterized spectroscopically and structurally using a variety of techni ...
reflectance measurement and modelling of high reflectivity
... This thesis is about the reflectance measurement of high reflectivity DBR stacks by using Fourier Transform Infrared (FT-IR) spectroscopy. First, the basic theory of optical multilayer is reviewed and then the principle operation of FT-IR spectroscopy is studied. Followed by method used to simulate ...
... This thesis is about the reflectance measurement of high reflectivity DBR stacks by using Fourier Transform Infrared (FT-IR) spectroscopy. First, the basic theory of optical multilayer is reviewed and then the principle operation of FT-IR spectroscopy is studied. Followed by method used to simulate ...
Synthesis, Characterization and Properties of Copper Clusters
... microscopy, transmission electron microscopy…in order to study the cluster size, their morphology and photoluminescent properties. Beside this, the great photoluminescent results obtained for our copper clusters lead us to a deep study on their photoluminescence stability and on their use as potenti ...
... microscopy, transmission electron microscopy…in order to study the cluster size, their morphology and photoluminescent properties. Beside this, the great photoluminescent results obtained for our copper clusters lead us to a deep study on their photoluminescence stability and on their use as potenti ...
i̇zmi̇r institute of technology graduate school of engineering
... It covers principles, including definitions, molecular symmetry, representation of groups and quantum mechanic and their applications. ...
... It covers principles, including definitions, molecular symmetry, representation of groups and quantum mechanic and their applications. ...
POLITECNICO DI MILANO Polo Regionale di Lecco Faculty of
... parameters that describe the type of the laser source such as rise time to peak power, number of pulses, and the half width at half maximum pulse width (which is in nano seconds regime) is discussed. ...
... parameters that describe the type of the laser source such as rise time to peak power, number of pulses, and the half width at half maximum pulse width (which is in nano seconds regime) is discussed. ...
Preparation of highly visible-light active N
... actual measurement. The electron paramagnetic resonance (EPR) spectra were recorded on an X-band Bruker EMX spectrometer operating at 100 KHz field modulation and 1 mW microwave power and equipped with a high-sensitivity cavity (ER 4119HS). The g values were determined using a DPPH standard. 2.4 Pho ...
... actual measurement. The electron paramagnetic resonance (EPR) spectra were recorded on an X-band Bruker EMX spectrometer operating at 100 KHz field modulation and 1 mW microwave power and equipped with a high-sensitivity cavity (ER 4119HS). The g values were determined using a DPPH standard. 2.4 Pho ...
Optical Pumping
... X. Other Optically Pumped Atoms. . . . . . . . . . . . . . . . . . . 237 pumping can also be detected by observing the AuoresA. Metastable States of the Heavy Noble Gases. . . . 237 cent light or byguoresceece moriitoring Ther. e are many B. Iead. . . . . . . . . . . . , . . . . . . . . . . . . . . ...
... X. Other Optically Pumped Atoms. . . . . . . . . . . . . . . . . . . 237 pumping can also be detected by observing the AuoresA. Metastable States of the Heavy Noble Gases. . . . 237 cent light or byguoresceece moriitoring Ther. e are many B. Iead. . . . . . . . . . . . , . . . . . . . . . . . . . . ...
Corrosion studies of LiH thin films
... resulted in the full conversion of LiOH to Li2O. Again, the techniques used in these studies lacked surface sensitivity and therefore it is likely that small amounts of LiOH were still present on the surface after heating but were not able to be observed. The peak shape used for fitting was the same ...
... resulted in the full conversion of LiOH to Li2O. Again, the techniques used in these studies lacked surface sensitivity and therefore it is likely that small amounts of LiOH were still present on the surface after heating but were not able to be observed. The peak shape used for fitting was the same ...
Adsorption and Reaction of SO2 with a Polycrystalline UO2 Film
... onto UO2(001)12 and polycrystalline UO2,13 as well as the interactions of thiophene with stoichiometric and O-deficient polycrystalline UO2,14 has been examined. Sulfur dioxide formed during the combustion of fossil fuels is a major air pollutant that causes health risks, environmental hazards, and ...
... onto UO2(001)12 and polycrystalline UO2,13 as well as the interactions of thiophene with stoichiometric and O-deficient polycrystalline UO2,14 has been examined. Sulfur dioxide formed during the combustion of fossil fuels is a major air pollutant that causes health risks, environmental hazards, and ...
Scanning angle total internal reflection Raman spectroscopy and
... where P0 is the incident photon flux, σ Dj is the frequency independent cross section for the jth molecular vibration mode, D is the number density of scatterers, dz is the path length of the laser in the sample and all frequency terms, (ν), are expressed in wavenumbers (cm-1). A full derivation of ...
... where P0 is the incident photon flux, σ Dj is the frequency independent cross section for the jth molecular vibration mode, D is the number density of scatterers, dz is the path length of the laser in the sample and all frequency terms, (ν), are expressed in wavenumbers (cm-1). A full derivation of ...
THE NEMATIC { SMECTIC-A PHASE TRANSITION: A HIGH
... 4.8 Measurement of \proportional droop" in the temperature-control system. . . 4.9 Schematic of temperature control system. . . . . . . . . . . . . . . . . . . . . . . 4.10 A time-series of the measured temperature. . . . . . . . . . . . . . . . . . . . 4.11 Two cause of interface smearing. . . . . ...
... 4.8 Measurement of \proportional droop" in the temperature-control system. . . 4.9 Schematic of temperature control system. . . . . . . . . . . . . . . . . . . . . . . 4.10 A time-series of the measured temperature. . . . . . . . . . . . . . . . . . . . 4.11 Two cause of interface smearing. . . . . ...
Raman microscopy in an electron microscope: combining chemical
... By applying a quite powerful laser system and a large number of molecules in the excitation volume high intensities of Raman scattering can be obtained. In the following chapters we will speak about micro-Raman set up’s which have usually a compact sized laser source. Therefore, large laser excitati ...
... By applying a quite powerful laser system and a large number of molecules in the excitation volume high intensities of Raman scattering can be obtained. In the following chapters we will speak about micro-Raman set up’s which have usually a compact sized laser source. Therefore, large laser excitati ...
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... are better donors than less polar substituents such as alcohols. As the lanthanide-ligand coordination is predominantly ionic in nature, negatively charged donor groups such as carboxylates, phosphonates and phosphinates are highly suitable. ...
... are better donors than less polar substituents such as alcohols. As the lanthanide-ligand coordination is predominantly ionic in nature, negatively charged donor groups such as carboxylates, phosphonates and phosphinates are highly suitable. ...
Thesis - Swinburne University of Technology
... platform to study the crossover from a Bardeen-Cooper-Schrie↵er (BCS) superfluid to a Bose-Einstein condensate (BEC) of composite bosons. This crossover is fascinating from a fundamental point of view as it involves the continuous evolution of a system whose physics changes from being dominated prim ...
... platform to study the crossover from a Bardeen-Cooper-Schrie↵er (BCS) superfluid to a Bose-Einstein condensate (BEC) of composite bosons. This crossover is fascinating from a fundamental point of view as it involves the continuous evolution of a system whose physics changes from being dominated prim ...
Matrix Isolation Spectroscopic and Theoretical Study of Carbon
... vibrational frequencies of the observed reaction products. The calculations were performed with the B3LYP density functional theory (DFT) method, where Becke’s three-parameter hybrid functional and the Lee−Yang−Parr correlation functional were used.29 The basis set used is 6-311+G(2df).30 The B3LYP ...
... vibrational frequencies of the observed reaction products. The calculations were performed with the B3LYP density functional theory (DFT) method, where Becke’s three-parameter hybrid functional and the Lee−Yang−Parr correlation functional were used.29 The basis set used is 6-311+G(2df).30 The B3LYP ...
Porphyrins. XXXI. Chemical Properties and Electronic Spectra of dO Transition-Metal Complexes
... troscope) had changed from the four-lined metal-free to the twolined metallocomplex. After cooling to room temperature, the contents of the tube was poured into water (50 ml). The aqueous mixture wa!> extracted with methylene dichloride (10-ml aliquots) until all the porphyrin was in the organic lay ...
... troscope) had changed from the four-lined metal-free to the twolined metallocomplex. After cooling to room temperature, the contents of the tube was poured into water (50 ml). The aqueous mixture wa!> extracted with methylene dichloride (10-ml aliquots) until all the porphyrin was in the organic lay ...
Raman Spectroscopy on Semiconductor Nanowires
... single GaAs nanowires with [111] growth axis. For further clarity, a schematic drawing of the nanowire with the corresponding set of axis, as used in Raman backscattering experiment, is presented in Fig. 5a. We studied nanowires presenting a mixture of zinc blende and wurtzite structure. In this cas ...
... single GaAs nanowires with [111] growth axis. For further clarity, a schematic drawing of the nanowire with the corresponding set of axis, as used in Raman backscattering experiment, is presented in Fig. 5a. We studied nanowires presenting a mixture of zinc blende and wurtzite structure. In this cas ...
sensors Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy
... detectable absorption losses αmin = 10–11 cm–1 in some cases, whereas fiber-cavity ring-down spectroscopy is by many orders of magnitude less sensitive (αmin = 0.1 cm–1 in the experiments described in section 2.2). We believe that the technique is only advantageous when the sensor head consists of a ...
... detectable absorption losses αmin = 10–11 cm–1 in some cases, whereas fiber-cavity ring-down spectroscopy is by many orders of magnitude less sensitive (αmin = 0.1 cm–1 in the experiments described in section 2.2). We believe that the technique is only advantageous when the sensor head consists of a ...
Full text - Simon Fraser University
... Two-dimensional materials, single-layer crystals of atomic thickness, including graphene and boron nitride, have attracted much interest in the last few decades. When electrons are confined to move in two dimensions, several extraordinary applications arise due to this physical effect. For example, th ...
... Two-dimensional materials, single-layer crystals of atomic thickness, including graphene and boron nitride, have attracted much interest in the last few decades. When electrons are confined to move in two dimensions, several extraordinary applications arise due to this physical effect. For example, th ...
Mössbauer spectroscopy
Mössbauer spectroscopy is a spectroscopic technique based on the Mössbauer effect. This effect, discovered by Rudolf Mössbauer in 1957, consists in the recoil-free, resonant absorption and emission of gamma rays in solids.Like NMR spectroscopy, Mössbauer spectroscopy probes tiny changes in the energy levels of an atomic nucleus in response to its environment. Typically, three types of nuclear interactions may be observed: an isomeric shift, also known as a chemical shift; quadrupole splitting; and magnetic or hyperfine splitting, also known as the Zeeman effect. Due to the high energy and extremely narrow line widths of gamma rays, Mössbauer spectroscopy is a very sensitive technique in terms of energy (and hence frequency) resolution, capable of detecting change in just a few parts per 1011.