Sub-THz Electron Spin Resonance spectroscopy based on a Martin
... surfaces,[8–16] or to unravel details of the reactions taking place at the surface of catalysts[17–27] requires ever greater resolution and sensitivity. This implies the use of ever great applied fields, which require in turn sample irradiation frequencies in the sub-THz range. While at frequencies ...
... surfaces,[8–16] or to unravel details of the reactions taking place at the surface of catalysts[17–27] requires ever greater resolution and sensitivity. This implies the use of ever great applied fields, which require in turn sample irradiation frequencies in the sub-THz range. While at frequencies ...
SHS_OH_flame_ApplOpt_revision_RJB
... 308 nm in an ethylene-air flame produced by a McKenna burner. This is the first known application of SHS in combustion. Although dispersive solutions (e.g., the grating spectrometer, heretofore abbreviated as GS) are commonly used to measure ultraviolet spectra, they suffer from an inability to acqu ...
... 308 nm in an ethylene-air flame produced by a McKenna burner. This is the first known application of SHS in combustion. Although dispersive solutions (e.g., the grating spectrometer, heretofore abbreviated as GS) are commonly used to measure ultraviolet spectra, they suffer from an inability to acqu ...
Catalyst characterization: characterization techniques
... have a total surface much higher than that corresponding to the external one. Most common catalysts have a specific surface area between 1 and 1000 m2 g-l, while their external specific surface area is in the range 0.01-10 m2 g-l. The knowledge of the morphological parameters is very important to un ...
... have a total surface much higher than that corresponding to the external one. Most common catalysts have a specific surface area between 1 and 1000 m2 g-l, while their external specific surface area is in the range 0.01-10 m2 g-l. The knowledge of the morphological parameters is very important to un ...
Synthesis of a Phosphorus-Containing Hybrid Porphyrin
... of 8b and 9b are completely planar, whereas that of 10 is nonplanar. Thus, replacement of the NH unit of thiaporphyrin with the PPh unit (from 9b to 10) induces a distortion of the porphyrin plane, where all the heterole subunits are slightly tilted to make a dish-like macrocyclic platform. Such a d ...
... of 8b and 9b are completely planar, whereas that of 10 is nonplanar. Thus, replacement of the NH unit of thiaporphyrin with the PPh unit (from 9b to 10) induces a distortion of the porphyrin plane, where all the heterole subunits are slightly tilted to make a dish-like macrocyclic platform. Such a d ...
Optical control of the spin of a magnetic atom in a semiconductor
... first approximation, the hole-Mn exchange interaction reduces to an Ising term J z S z and shifts the emission energy of the QD, depending on the relative orientation of the spin of the Mn (S z ) and hole (J z ) [19–22]. As the spin state of the Mn atom fluctuates during the optical measurements, th ...
... first approximation, the hole-Mn exchange interaction reduces to an Ising term J z S z and shifts the emission energy of the QD, depending on the relative orientation of the spin of the Mn (S z ) and hole (J z ) [19–22]. As the spin state of the Mn atom fluctuates during the optical measurements, th ...
6 Product Operators
... between these energy levels which are detected in spectroscopy. To understand the spectrum, therefore, it is necessary to have a knowledge of the energy levels and this in turn requires a knowledge of the Hamiltonian operator. In NMR, the Hamiltonian is seen as having a more subtle effect than simpl ...
... between these energy levels which are detected in spectroscopy. To understand the spectrum, therefore, it is necessary to have a knowledge of the energy levels and this in turn requires a knowledge of the Hamiltonian operator. In NMR, the Hamiltonian is seen as having a more subtle effect than simpl ...
A Pulsed Field Gradient Spin-Echo Method for Diffusion
... The echo attenuations resulting from the diffusion experiments were recorded in real time domain at the time of the echo; t 5 4 t . Thereby any impact from magnetic field transients on the experimental datasets was minimized. No shift in the appearance of the echo peak was observed, and any signific ...
... The echo attenuations resulting from the diffusion experiments were recorded in real time domain at the time of the echo; t 5 4 t . Thereby any impact from magnetic field transients on the experimental datasets was minimized. No shift in the appearance of the echo peak was observed, and any signific ...
6 Product Operators
... eigenfunctions are the "energy levels" of the system, and it is transitions between these energy levels which are detected in spectroscopy. To understand the spectrum, therefore, it is necessary to have a knowledge of the energy levels and this in turn requires a knowledge of the Hamiltonian operato ...
... eigenfunctions are the "energy levels" of the system, and it is transitions between these energy levels which are detected in spectroscopy. To understand the spectrum, therefore, it is necessary to have a knowledge of the energy levels and this in turn requires a knowledge of the Hamiltonian operato ...
Appendix D – Raman Spectra
... visible, although more difficult to detect because of its wide shape and because of the noisy baseline. The G-peak was sharp and visible on the spectrum, and a double peak was present, with the second peak much smaller and lower in Raman shift than the first, as is expected by past results [6]. For ...
... visible, although more difficult to detect because of its wide shape and because of the noisy baseline. The G-peak was sharp and visible on the spectrum, and a double peak was present, with the second peak much smaller and lower in Raman shift than the first, as is expected by past results [6]. For ...
Cyclam ``capa` POT.4` to ``capa` POT.3` denticity change
... of this interest has surged from the biological functions of nitric oxide and the large number of physiological functions and pathologies in which NO is involved.44 For instance, NO acts as a biological messenger responsible for vasodilatation, inhibits platelet aggregation, plays a role in the immu ...
... of this interest has surged from the biological functions of nitric oxide and the large number of physiological functions and pathologies in which NO is involved.44 For instance, NO acts as a biological messenger responsible for vasodilatation, inhibits platelet aggregation, plays a role in the immu ...
Photo-induced metal–ligand bond weakening, potential
... for example, the p bonding in the xy plane is negligible and cannot be strengthened. (The dxy orbital is formally nonbonding.) The net result is a weakened metal in-plane ligand bond. As a second illustration of the analysis of the bonding changes caused by a particular transition, consider 4B1g 4 ...
... for example, the p bonding in the xy plane is negligible and cannot be strengthened. (The dxy orbital is formally nonbonding.) The net result is a weakened metal in-plane ligand bond. As a second illustration of the analysis of the bonding changes caused by a particular transition, consider 4B1g 4 ...
Saturation
... Linear and Nonlinear Absorption In case the incident wave with spectral energy density ( ) I ( ) c And spectral width L Which is large compared to the halfwidth of the Absorption profile L The total intensity becomes I I ( )d I ( 0 ) L ...
... Linear and Nonlinear Absorption In case the incident wave with spectral energy density ( ) I ( ) c And spectral width L Which is large compared to the halfwidth of the Absorption profile L The total intensity becomes I I ( )d I ( 0 ) L ...
Quantized field description of rotor frequency
... Hamiltonian in the quantized field and the normal rotating frame representation. The magnitude of this Hamiltonian peaks around the rotational resonance conditions and has a width depending on the number of rotor periods between the pulses. Its interaction strength can be very significant at the n ...
... Hamiltonian in the quantized field and the normal rotating frame representation. The magnitude of this Hamiltonian peaks around the rotational resonance conditions and has a width depending on the number of rotor periods between the pulses. Its interaction strength can be very significant at the n ...
Optical probing of spin fluctuations of a single paramagnetic Mn
... component corresponds to the radiative lifetime of the exciton as already measured in nonmagnetic QDs. The long component is associated with the existence of the dark excitons.12,13 Direct recombination of the dark exciton can be observed in some Mn-doped QDs because of a slight admixture of the bri ...
... component corresponds to the radiative lifetime of the exciton as already measured in nonmagnetic QDs. The long component is associated with the existence of the dark excitons.12,13 Direct recombination of the dark exciton can be observed in some Mn-doped QDs because of a slight admixture of the bri ...
chapter 24 design of magnetic resonance systems
... Shorter T 2 results in less signal. The static field of MR scanners must be very uniform to prevent signal loss and image artifacts. Typically, B 0 inhomogeneity of MR scanners is about 10 parts per million (ppm) over perhaps a 40-cm-diameter spherical volume (dsv) for imaging.8 In spectroscopy, mea ...
... Shorter T 2 results in less signal. The static field of MR scanners must be very uniform to prevent signal loss and image artifacts. Typically, B 0 inhomogeneity of MR scanners is about 10 parts per million (ppm) over perhaps a 40-cm-diameter spherical volume (dsv) for imaging.8 In spectroscopy, mea ...
Relation between s-Polarized and p-Polarized Internal Reflection
... spectroscopy include (1) simultaneous probing of a wide variety of chemical bonds in organic, inorganic or hybrid materials, (2) sensitivity to measure films down to molecular thickness, (3) quantitative analysis and (4) widely available equipment. Three optical configurations for polarized IR spect ...
... spectroscopy include (1) simultaneous probing of a wide variety of chemical bonds in organic, inorganic or hybrid materials, (2) sensitivity to measure films down to molecular thickness, (3) quantitative analysis and (4) widely available equipment. Three optical configurations for polarized IR spect ...
Mechanical mapping with chemical specificity by confocal Brillouin
... Brillouin spectra were collected with a microfocused setup26 using a tandem 3+3 Fabry-Perot interferometer.24 We used a single-mode Excelsior Diode-Pumped Solid-State (DPSS) laser with 532 nm wavelength and 5 mW output power measured at the sample. A Zeiss dark-field objective (numerical aperture 0. ...
... Brillouin spectra were collected with a microfocused setup26 using a tandem 3+3 Fabry-Perot interferometer.24 We used a single-mode Excelsior Diode-Pumped Solid-State (DPSS) laser with 532 nm wavelength and 5 mW output power measured at the sample. A Zeiss dark-field objective (numerical aperture 0. ...
Raman Spectroscopy: Introductory Tutorial
... Infrared and Raman Spectra of Inorganic and Coordination Compounds : Theory and Applications in Inorganic Chemistry (Volume A) by Kazuo Nakamoto Infrared and Raman Spectra of Inorganic and Coordination Compounds : Applications in Coordination, Organometallic, and Bioinorganic Chemistry (Volume B) by ...
... Infrared and Raman Spectra of Inorganic and Coordination Compounds : Theory and Applications in Inorganic Chemistry (Volume A) by Kazuo Nakamoto Infrared and Raman Spectra of Inorganic and Coordination Compounds : Applications in Coordination, Organometallic, and Bioinorganic Chemistry (Volume B) by ...
Order Parameters P2 , P4 , and P6 of Aligned Nematic Liquid
... for characterization of orientation are as follows: (i) for correct determination of order parameter, one needs to know angle χ, or should choose dyes with χ close to zero, and (ii) only ⟨P2⟩ can be determined. EPR spectroscopy (spin probe and spin label method) is rather widely used for study of dy ...
... for characterization of orientation are as follows: (i) for correct determination of order parameter, one needs to know angle χ, or should choose dyes with χ close to zero, and (ii) only ⟨P2⟩ can be determined. EPR spectroscopy (spin probe and spin label method) is rather widely used for study of dy ...
Stockholm University
... to protonation, which most likely is the main reason for the differences in chemical shifts. Other amino acid residues that are significantly affected by the change in pH are A2 and Q6. The Hα chemical shifts for both these residues are likely to be influenced by the change in environment of E1 and E3 ...
... to protonation, which most likely is the main reason for the differences in chemical shifts. Other amino acid residues that are significantly affected by the change in pH are A2 and Q6. The Hα chemical shifts for both these residues are likely to be influenced by the change in environment of E1 and E3 ...
Novel Example of a Chain Structure Formed by 1,4
... anisotropic displacement parameters, hydrogen coordinates, and equivalent isotropic displacement parameters are also included in the Supporting Information. Magnetic Measurements. The magnetic properties of the investigated compound are in the temperature range of 2-300 K. Variable-temperature susce ...
... anisotropic displacement parameters, hydrogen coordinates, and equivalent isotropic displacement parameters are also included in the Supporting Information. Magnetic Measurements. The magnetic properties of the investigated compound are in the temperature range of 2-300 K. Variable-temperature susce ...
Antimony-ligated dysprosium single-molecule magnets as catalysts
... with oblate electron density in the most magnetic mJ states – such as Dy3+ – typically occur when strong crystal elds are applied on high-order symmetry axes.8 Thus, the current record anisotropy barrier is 1261 cm1, which was determined for a D5h-symmetric dysprosium complex with a pentagonal bip ...
... with oblate electron density in the most magnetic mJ states – such as Dy3+ – typically occur when strong crystal elds are applied on high-order symmetry axes.8 Thus, the current record anisotropy barrier is 1261 cm1, which was determined for a D5h-symmetric dysprosium complex with a pentagonal bip ...
Phys. Rev. Lett. 110, 156402 - Institute for Quantum Optics and
... magnetometry. An outstanding challenge is the realization of controlled interactions between several NV centers, required for quantum gates or to generate entangled spin states for quantum-enhanced sensing. One approach toward this goal is to couple NV centers to a resonant optical [8,9] or mechanic ...
... magnetometry. An outstanding challenge is the realization of controlled interactions between several NV centers, required for quantum gates or to generate entangled spin states for quantum-enhanced sensing. One approach toward this goal is to couple NV centers to a resonant optical [8,9] or mechanic ...
Formicamycins, antibacterial polyketides produced by Streptomyces
... Primary bioassays using B. subtilis, C. albicans and L. prolicans indicated that S. formicae produces compounds with antibacterial and antifungal activity when grown on solid medium. Fractionation over silica gel showed that these activities could be separated and high-resolution LCMS analysis sugg ...
... Primary bioassays using B. subtilis, C. albicans and L. prolicans indicated that S. formicae produces compounds with antibacterial and antifungal activity when grown on solid medium. Fractionation over silica gel showed that these activities could be separated and high-resolution LCMS analysis sugg ...
Nuclear magnetic resonance spectroscopy
Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is a research technique that exploits the magnetic properties of certain atomic nuclei. It determines the physical and chemical properties of atoms or the molecules in which they are contained. It relies on the phenomenon of nuclear magnetic resonance and can provide detailed information about the structure, dynamics, reaction state, and chemical environment of molecules. The intramolecular magnetic field around an atom in a molecule changes the resonance frequency, thus giving access to details of the electronic structure of a molecule.Most frequently, NMR spectroscopy is used by chemists and biochemists to investigate the properties of organic molecules, although it is applicable to any kind of sample that contains nuclei possessing spin. Suitable samples range from small compounds analyzed with 1-dimensional proton or carbon-13 NMR spectroscopy to large proteins or nucleic acids using 3 or 4-dimensional techniques. The impact of NMR spectroscopy on the sciences has been substantial because of the range of information and the diversity of samples, including solutions and solids.NMR spectra are unique, well-resolved, analytically tractable and often highly predictable for small molecules. Thus, in organic chemistry practice, NMR analysis is used to confirm the identity of a substance. Different functional groups are obviously distinguishable, and identical functional groups with differing neighboring substituents still give distinguishable signals. NMR has largely replaced traditional wet chemistry tests such as color reagents for identification. A disadvantage is that a relatively large amount, 2–50 mg, of a purified substance is required, although it may be recovered. Preferably, the sample should be dissolved in a solvent, because NMR analysis of solids requires a dedicated MAS machine and may not give equally well-resolved spectra. The timescale of NMR is relatively long, and thus it is not suitable for observing fast phenomena, producing only an averaged spectrum. Although large amounts of impurities do show on an NMR spectrum, better methods exist for detecting impurities, as NMR is inherently not very sensitive.NMR spectrometers are relatively expensive; universities usually have them, but they are less common in private companies. Modern NMR spectrometers have a very strong, large and expensive liquid helium-cooled superconducting magnet, because resolution directly depends on magnetic field strength. Less expensive machines using permanent magnets and lower resolution are also available, which still give sufficient performance for certain application such as reaction monitoring and quick checking of samples. There are even benchtop NMR spectrometers.