Spectroscopy – I. Gratings and Prisms
... the other – and to do this with accurately maintained shape. “Blazing” allows the grating efficiency to be peaked at a selected wavelength region. Nowadays, a number of different techniques are available – such as electron-beam etching and the production of holographic and “volume-phase” holographic ...
... the other – and to do this with accurately maintained shape. “Blazing” allows the grating efficiency to be peaked at a selected wavelength region. Nowadays, a number of different techniques are available – such as electron-beam etching and the production of holographic and “volume-phase” holographic ...
High optical absorption in graphene
... where metallic elements and other materials adding functionality are combined into nanocomposites. By tuning the geometrical properties and thereby the effective dielectric function of the nanocomposite structure in relation to the dielectric properties of the surrounding media, the impedance of the ...
... where metallic elements and other materials adding functionality are combined into nanocomposites. By tuning the geometrical properties and thereby the effective dielectric function of the nanocomposite structure in relation to the dielectric properties of the surrounding media, the impedance of the ...
Tuning of resonance-spacing in a traveling-wave
... a power coupling coefficient of κ ex2 = 0.09 . The horizontal axes in Figs. 2(a)-2(f) is frequency detuning with respect to one of the modes of the uncoupled resonator (near λ0 = 1.55 µm) normalized to the FSR of the uncoupled resonator. Figures 2(a) (2(d)), 2(b) (2(e)), and 2(c) (2(f)) show the spe ...
... a power coupling coefficient of κ ex2 = 0.09 . The horizontal axes in Figs. 2(a)-2(f) is frequency detuning with respect to one of the modes of the uncoupled resonator (near λ0 = 1.55 µm) normalized to the FSR of the uncoupled resonator. Figures 2(a) (2(d)), 2(b) (2(e)), and 2(c) (2(f)) show the spe ...
Application of ion scattering techniques to characterize polymer
... characteristic of their depths and kinematic factors. In addition, a high flux of 4 He ions are forward scattered by heavy atoms in the substrate (i.e. silicon) with an energy that again depends on the depth of the scattering event. This high flux of 4 He would overwhelm the relatively low flux of 1 ...
... characteristic of their depths and kinematic factors. In addition, a high flux of 4 He ions are forward scattered by heavy atoms in the substrate (i.e. silicon) with an energy that again depends on the depth of the scattering event. This high flux of 4 He would overwhelm the relatively low flux of 1 ...
feature article
... but for large molecules (10 atoms or more) it is impractical. The spectra show intramolecular line broadening in which information on individual eigenstates is highly averaged. This state of affairs is very similar to the behavior of macroscopic systems and it is obvious that methods and techniques ...
... but for large molecules (10 atoms or more) it is impractical. The spectra show intramolecular line broadening in which information on individual eigenstates is highly averaged. This state of affairs is very similar to the behavior of macroscopic systems and it is obvious that methods and techniques ...
ammonia clusters - Department of Chemistry
... Previous studies from a number of laboratories have shown consistent spectroscopic motifs in alkaline-earth cations solvated by polar solvents: as the cluster size increases, the metal-centered transitions become redshifted, reaching a maximum at a relatively small number of solvent molecules.7–12 I ...
... Previous studies from a number of laboratories have shown consistent spectroscopic motifs in alkaline-earth cations solvated by polar solvents: as the cluster size increases, the metal-centered transitions become redshifted, reaching a maximum at a relatively small number of solvent molecules.7–12 I ...
Experimental study on Extremely-Thin-Body In0
... The amount of strain in the SiGe layer in the fabricated device was evaluated by Raman spectroscopy. It is well known that the biaxial strain is partially relaxed when a biaxially strained layer is etched into a narrow mesa with submicron width such as optical waveguides. Ge diffusion during high-te ...
... The amount of strain in the SiGe layer in the fabricated device was evaluated by Raman spectroscopy. It is well known that the biaxial strain is partially relaxed when a biaxially strained layer is etched into a narrow mesa with submicron width such as optical waveguides. Ge diffusion during high-te ...
After referees Review article final_FINAL3
... the beam to be rastered point by point to form a large grid, which can then be stitched together post-collection to form a single chemical image. Since the sample has to be moved following each acquisition point, a significant proportion of collection time is used translating the stage, particularly ...
... the beam to be rastered point by point to form a large grid, which can then be stitched together post-collection to form a single chemical image. Since the sample has to be moved following each acquisition point, a significant proportion of collection time is used translating the stage, particularly ...
Full-Text PDF
... and its derivative (o-FIr, m-FIr, p-FIr) with dimethylamine substituted at the picolinic acid (N∧ O) ligand were fully investigated by density functional theory and time-dependent density functional theory. The simulated electronic structure, as well as absorption and emission spectra of FIrpic are ...
... and its derivative (o-FIr, m-FIr, p-FIr) with dimethylamine substituted at the picolinic acid (N∧ O) ligand were fully investigated by density functional theory and time-dependent density functional theory. The simulated electronic structure, as well as absorption and emission spectra of FIrpic are ...
Oxygen Isotope Effects as Structural and Mechanistic Probes in
... 2NH3). Also included is the subject of this Inorganic Chemistry Forum, the reduction and activation of molecular oxygen. Electron transfer to O2 controls energy balance within the cell during aerobic respiration, biosynthetic reactions, and catabolic processes. Although thermodynamically less challe ...
... 2NH3). Also included is the subject of this Inorganic Chemistry Forum, the reduction and activation of molecular oxygen. Electron transfer to O2 controls energy balance within the cell during aerobic respiration, biosynthetic reactions, and catabolic processes. Although thermodynamically less challe ...
SENSITIZATION OF LANTHANIDE IONS BY TRIARYLBORON FUNCTIONALIZED B-DIKETONES
... class of ligands were found to be effective in activating Eu(III) emission while the second class is effective in activating Tb(III) emission. The Eu(III) complexes were found to have a low quantum efficiency, but can it can be greatly enhanced by the addition of fluoride ions. In contrast, the Tb(I ...
... class of ligands were found to be effective in activating Eu(III) emission while the second class is effective in activating Tb(III) emission. The Eu(III) complexes were found to have a low quantum efficiency, but can it can be greatly enhanced by the addition of fluoride ions. In contrast, the Tb(I ...
Triple resonance for a three-level system of a chiral molecule
... paradox for this new theory, namely the optical activity would vanish in quantum mechanics for any molecule in a stationary state.2),3) In order to solve this problem, he thought of a tiny perturbation term between enantiomers, which could mix the lefthanded and right-handed molecules by the tunneli ...
... paradox for this new theory, namely the optical activity would vanish in quantum mechanics for any molecule in a stationary state.2),3) In order to solve this problem, he thought of a tiny perturbation term between enantiomers, which could mix the lefthanded and right-handed molecules by the tunneli ...
Scanning Transmission Electron Microscopy
... columns and have their gun at the top of the column. The pertinent optical elements are identical, and for a TEM/STEM Figure 2–1 should be regarded as being inverted. In many ways, the STEM is similar to the more widely known scanning electron microscope (SEM). An electron gun generates a beam of el ...
... columns and have their gun at the top of the column. The pertinent optical elements are identical, and for a TEM/STEM Figure 2–1 should be regarded as being inverted. In many ways, the STEM is similar to the more widely known scanning electron microscope (SEM). An electron gun generates a beam of el ...
Quantum cascade transitions in nanostructures
... wells, which is the primary mechanism behind this laser. This is a well-researched and well-reviewed topic and we touch upon only those aspects that are relevant for our main topic of review—quantum cascade transitions (QCTs) in nanostructured systems. In section 3, we briefly review the fundamentals ...
... wells, which is the primary mechanism behind this laser. This is a well-researched and well-reviewed topic and we touch upon only those aspects that are relevant for our main topic of review—quantum cascade transitions (QCTs) in nanostructured systems. In section 3, we briefly review the fundamentals ...
Computational Study of Structure and Reactivity
... kept fixed to their bulk positions. A Bader charge analysis27,28 was employed to determine the local charge of atoms in the system, defined by the integrated charge density within Bader volumes around the atoms. Magnetic moments were determined by calculating the integrated spin density within the Bad ...
... kept fixed to their bulk positions. A Bader charge analysis27,28 was employed to determine the local charge of atoms in the system, defined by the integrated charge density within Bader volumes around the atoms. Magnetic moments were determined by calculating the integrated spin density within the Bad ...
Focal shift of silicon microlen array in mid
... We have also traced the focal shift of MLAs in mid-infrared regime experimentally and confirmed the simulation. The effect of fabrication error and surface roughness on focal shift were also discussed. The rigorous calculation method in this paper provides a reference value to account with a focal s ...
... We have also traced the focal shift of MLAs in mid-infrared regime experimentally and confirmed the simulation. The effect of fabrication error and surface roughness on focal shift were also discussed. The rigorous calculation method in this paper provides a reference value to account with a focal s ...
Near-Infrared Spectroscopy
... When light is absorbed its energy is dissipated as thermal energy throughout the absorber (Elwell & Phil, 1995). Absorption occurs at specific wavelengths, determined by the molecular properties of the materials in the light path (Jöbsis, 1977; Wray et al., 1988). The primary light-absorbing compoun ...
... When light is absorbed its energy is dissipated as thermal energy throughout the absorber (Elwell & Phil, 1995). Absorption occurs at specific wavelengths, determined by the molecular properties of the materials in the light path (Jöbsis, 1977; Wray et al., 1988). The primary light-absorbing compoun ...
Interactions of Ammonia with a NiO( 100) Surface
... peak maximum shifts from 343 K a t low exposure (e = 0.07 ML) to 299 K at a coverage approaching saturation of the first layer, as shown in Figure 2. Further exposure to ammonia results in the appearance of two new features at lower temperatures. The sharp desorption feature (y state) at 109 K, whos ...
... peak maximum shifts from 343 K a t low exposure (e = 0.07 ML) to 299 K at a coverage approaching saturation of the first layer, as shown in Figure 2. Further exposure to ammonia results in the appearance of two new features at lower temperatures. The sharp desorption feature (y state) at 109 K, whos ...
20.2 Oxidation Numbers
... to wash the salt off your car? Many parts of your car’s body are made of steel, an iron alloy. The salt can cause the metal to corrode, or rust, faster than it would otherwise because when mixed with water, the salt creates a conductive solution that allows electrons to transfer more easily. ...
... to wash the salt off your car? Many parts of your car’s body are made of steel, an iron alloy. The salt can cause the metal to corrode, or rust, faster than it would otherwise because when mixed with water, the salt creates a conductive solution that allows electrons to transfer more easily. ...
Light & Matter: Absorption and Scattering
... is the way by which the energy of a photon is taken up by matter, typically the electrons of an atom. • The absorbance of a medium is defined as the ratio of absorbed and incident intensities. • Absorption is due to a partial conversion of light energy into heat motion or certain vibrations of ...
... is the way by which the energy of a photon is taken up by matter, typically the electrons of an atom. • The absorbance of a medium is defined as the ratio of absorbed and incident intensities. • Absorption is due to a partial conversion of light energy into heat motion or certain vibrations of ...
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... In the PL spectrum recorded in the bulk sample (Fig. S4) on a backscattering geometry (standard lens, no confocal), we observe several contributions that we split in two groups. ...
... In the PL spectrum recorded in the bulk sample (Fig. S4) on a backscattering geometry (standard lens, no confocal), we observe several contributions that we split in two groups. ...
Metal-to-ligand and ligand-to-metal charge transfer in thin films of
... 2.2 Ligand field multiplet calculations In order to extract quantitative information from L2,3-edges absorption spectra, experimental XAS spectra were modelled using the so-called ligand field multiplet (LFM) theory developed by Thole21 in the framework established by Cowan22 and Butler.23 This approa ...
... 2.2 Ligand field multiplet calculations In order to extract quantitative information from L2,3-edges absorption spectra, experimental XAS spectra were modelled using the so-called ligand field multiplet (LFM) theory developed by Thole21 in the framework established by Cowan22 and Butler.23 This approa ...
Ionization of Rydberg atoms by standing
... and the beam powers and focal diameters employed in the experiment. There are no other free parameters in the simulations. For a lattice with perfect contrast and for atoms frozen in place at either intensity maxima or minima, the ratio of tPI for initial condition CMIN to that for CMAX would be infi ...
... and the beam powers and focal diameters employed in the experiment. There are no other free parameters in the simulations. For a lattice with perfect contrast and for atoms frozen in place at either intensity maxima or minima, the ratio of tPI for initial condition CMIN to that for CMAX would be infi ...
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.