Hyper-Raman scattering and the selection rules for the wave vector
... several systems for gathering the scattered light (Fig. 2): at an angle 90" (a), forward (b, e), and backward (c, d). The exciting radiation was focused by lens O,,the focal length of which was 4 cm in scheme a and 24 cm in schemes b-e. Schemes b-d, the interference filter I F reflected totally the ...
... several systems for gathering the scattered light (Fig. 2): at an angle 90" (a), forward (b, e), and backward (c, d). The exciting radiation was focused by lens O,,the focal length of which was 4 cm in scheme a and 24 cm in schemes b-e. Schemes b-d, the interference filter I F reflected totally the ...
Raman Spectroscopy and Imaging of Graphene
... to fabricate graphene, such as micromechanical cleavage of graphite [2] and epitaxial growth on SiC substrates [30, 31]. The former can be used to obtain high quality graphene sheets which are comparable to that in graphite, but is restricted by small sample dimensions and low visibility. Epitaxial ...
... to fabricate graphene, such as micromechanical cleavage of graphite [2] and epitaxial growth on SiC substrates [30, 31]. The former can be used to obtain high quality graphene sheets which are comparable to that in graphite, but is restricted by small sample dimensions and low visibility. Epitaxial ...
Femtosecond spectroscopy of solid hydrogen - diss.fu
... Fourier transform infrared spectroscopy in the light of rotational alignment experiments with matrix isolated molecules. Cryogenic hydrogen is a molecular quantum crystal with outstanding properties. Its weak interactions and large lattice constant allow nearly free rotation of many embedded impurit ...
... Fourier transform infrared spectroscopy in the light of rotational alignment experiments with matrix isolated molecules. Cryogenic hydrogen is a molecular quantum crystal with outstanding properties. Its weak interactions and large lattice constant allow nearly free rotation of many embedded impurit ...
Gravity Gradient Survey with a Mobile Atom
... to be valuable tools for measuring gravitational and inertial effects. In particular, gravimeters, gradiometers, and gyroscopes based on atom interferometry have all demonstrated high accuracies competitive with state-of-the-art commercial technology. We describe here the development and operation o ...
... to be valuable tools for measuring gravitational and inertial effects. In particular, gravimeters, gradiometers, and gyroscopes based on atom interferometry have all demonstrated high accuracies competitive with state-of-the-art commercial technology. We describe here the development and operation o ...
The influence of growth temperature on CVD grown graphene on SiC
... instance a wafer. Different methods can be used to disperse graphene in a non liquid-phase. By vacuum filtration or drop-casting where a drop of solution is deposed onto a substrate and graphene flakes remain when the solvent evaporates. But the easiest way is to prepare graphene directly onto the ...
... instance a wafer. Different methods can be used to disperse graphene in a non liquid-phase. By vacuum filtration or drop-casting where a drop of solution is deposed onto a substrate and graphene flakes remain when the solvent evaporates. But the easiest way is to prepare graphene directly onto the ...
A mobile, high-precision atom-interferometer and its
... (GAIN) project has been started to meet this requirement and to provide best possible accuracy at the same time. It aims to realize an alternative to other types of gravimeters and to combine important qualities such as high sensitivity and absolute accuracy in one instrument. The GAIN sensor is bas ...
... (GAIN) project has been started to meet this requirement and to provide best possible accuracy at the same time. It aims to realize an alternative to other types of gravimeters and to combine important qualities such as high sensitivity and absolute accuracy in one instrument. The GAIN sensor is bas ...
Brillouin scattering at high pressure: an overview
... only possible to use the backscattering geometry (only one experiment has been performed in the platelet geometry with this type of cell).8 Unfortunately in the backscattering geometry, the selection rules favor the longitudinal mode, so most of the experiments performed in this geometry only give i ...
... only possible to use the backscattering geometry (only one experiment has been performed in the platelet geometry with this type of cell).8 Unfortunately in the backscattering geometry, the selection rules favor the longitudinal mode, so most of the experiments performed in this geometry only give i ...
Physical properties of silver oxide thin films by pulsed laser deposition
... tetragonal [5–7]. Silver oxide thin films have been prepared by several techniques: RF and dc sputtering [8, 9], thermal evaporation [10], chemical synthesis [2] and by pulsed laser deposition (PLD) [11]. Our earlier studies [8] on silver oxide thin films prepared by the reactive dc magnetron sputte ...
... tetragonal [5–7]. Silver oxide thin films have been prepared by several techniques: RF and dc sputtering [8, 9], thermal evaporation [10], chemical synthesis [2] and by pulsed laser deposition (PLD) [11]. Our earlier studies [8] on silver oxide thin films prepared by the reactive dc magnetron sputte ...
Nanoreplicated positive and inverted submicrometer polymer
... Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive and versatile technique in analytical chemistry. The applications of SERS span a range of fields including bacteria detection, water contamination detection, protein-DNA interaction analysis, forensic investigation, and archeological i ...
... Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive and versatile technique in analytical chemistry. The applications of SERS span a range of fields including bacteria detection, water contamination detection, protein-DNA interaction analysis, forensic investigation, and archeological i ...
Modulating the electronic structures of graphene by controllable
... The evolution of electronic structures of hydrogenated graphene with different amount of hydrogen 共H兲 coverage was investigated by ultraviolet photoemission spectroscopy and optical absorption spectroscopy. Raman spectroscopy and x-ray photoelectron spectroscopy were used to monitor and evaluate the ...
... The evolution of electronic structures of hydrogenated graphene with different amount of hydrogen 共H兲 coverage was investigated by ultraviolet photoemission spectroscopy and optical absorption spectroscopy. Raman spectroscopy and x-ray photoelectron spectroscopy were used to monitor and evaluate the ...
Phonons in III-nitride thinfilms, bulk and nanowires: a closer look into
... growth techniques allowed the growth of higher quality layers. The growth by molecular beam epitaxy (MBE), for instance, enabled obtaining InN thin films with reduced free electron concentrations (< 1018 cm−3 ). New absorption experiments performed in those layers demonstrated that InN has a much sm ...
... growth techniques allowed the growth of higher quality layers. The growth by molecular beam epitaxy (MBE), for instance, enabled obtaining InN thin films with reduced free electron concentrations (< 1018 cm−3 ). New absorption experiments performed in those layers demonstrated that InN has a much sm ...
Elaboration and optimization of tellurite-based
... only the largest T reported for these highly nonlinear glasses to date, but coincides with a commensurate decrease of the refractive index. A hydroxyl purification has been developed that when employed, resulted in high purity preform materials exhibiting a limited absorption in the transmission b ...
... only the largest T reported for these highly nonlinear glasses to date, but coincides with a commensurate decrease of the refractive index. A hydroxyl purification has been developed that when employed, resulted in high purity preform materials exhibiting a limited absorption in the transmission b ...
SOIL PENETROMETER WITH RAMAN SAMPLING
... 4.12 Histogram of pixel noise distribution at 298 and 309 K for the uncooled camera ...................................................................................................................... 68 4.13 Dark noise intensity squared versus temperature for the uncooled camera at 1/10 seconds o ...
... 4.12 Histogram of pixel noise distribution at 298 and 309 K for the uncooled camera ...................................................................................................................... 68 4.13 Dark noise intensity squared versus temperature for the uncooled camera at 1/10 seconds o ...
Results from an Extremely Sensitive Rayleigh
... Raman scattering, the incident light excites the atom or molecule up a level from the ground state as before, however, when the photon is re-emitted, it is of a different frequency than the incident photon. For this reason, the Raman scatter detection channel must be designed to accept a different w ...
... Raman scattering, the incident light excites the atom or molecule up a level from the ground state as before, however, when the photon is re-emitted, it is of a different frequency than the incident photon. For this reason, the Raman scatter detection channel must be designed to accept a different w ...
Light & Matter: Absorption and Scattering
... sample (the complementary color pairs are indicated by the yellow dotted lines). Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) is absorbed in order to excite the molecule. Other photons transmits unaffected and, if the radiation ...
... sample (the complementary color pairs are indicated by the yellow dotted lines). Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) is absorbed in order to excite the molecule. Other photons transmits unaffected and, if the radiation ...
Nonlinear effects in Silicon Waveguides
... • For sufficiently intense pulses, the pulse spectrum can become so broad that it extends over a frequency range exceeding 100 THz. • Such extreme spectral broadening is referred to as supercontinuum generation. • This phenomenon was first observed in solid and gases more than 35 years ago (late 196 ...
... • For sufficiently intense pulses, the pulse spectrum can become so broad that it extends over a frequency range exceeding 100 THz. • Such extreme spectral broadening is referred to as supercontinuum generation. • This phenomenon was first observed in solid and gases more than 35 years ago (late 196 ...
Introduction to Isotope Effect
... particles are grouped together because they are stable (excluding from the radioactive triton which has a half-life of about 12 years and so may be treated as a stable entity for most practical purpose), have no bound excited states (except the α-particles which have two excited states at about 20 a ...
... particles are grouped together because they are stable (excluding from the radioactive triton which has a half-life of about 12 years and so may be treated as a stable entity for most practical purpose), have no bound excited states (except the α-particles which have two excited states at about 20 a ...
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 ...
Adaptive-Optics Compensation through a High-Gain Raman Amplifier of
... The applicability of Raman amplification to the problem ofhigh-power laser propagation through a turbulent atmosphere was investigated in a two-part experimental program. The goal of the program wasto determine the extent of phasefront preservation possible in a high-gain Raman amplifier. The utilit ...
... The applicability of Raman amplification to the problem ofhigh-power laser propagation through a turbulent atmosphere was investigated in a two-part experimental program. The goal of the program wasto determine the extent of phasefront preservation possible in a high-gain Raman amplifier. The utilit ...
Soliton collision and Raman gain regimes in continuous
... mechanisms, which broaden the spectrum of the light into a so-called supercontinuum (SC) as it propagates through the medium. Photonic crystal fibers (PCFs) are often used as the nonlinear medium, not only because the silica core confining the light can be made very small, thus increasing the intens ...
... mechanisms, which broaden the spectrum of the light into a so-called supercontinuum (SC) as it propagates through the medium. Photonic crystal fibers (PCFs) are often used as the nonlinear medium, not only because the silica core confining the light can be made very small, thus increasing the intens ...
Scanning angle total internal reflection Raman spectroscopy and
... In Chapter 3, improvement of the scanning angle TIR Raman microscope and a Raman signal enhancement technique are described for the TIR geometry using a thin, smooth, gold film at the prism / sample interface as a means to increase the magnitude of the mean squared electric field (MSEF) encountered ...
... In Chapter 3, improvement of the scanning angle TIR Raman microscope and a Raman signal enhancement technique are described for the TIR geometry using a thin, smooth, gold film at the prism / sample interface as a means to increase the magnitude of the mean squared electric field (MSEF) encountered ...
Theoretical Modeling of Magnesium Ion Imprints in the Raman
... themselves, they cause notable changes in the water Raman signal. Therefore, in this study, we used a combination of Raman spectroscopy and computer modeling to analyze the magnesium hydration shell and origin of the signal. In the measured spectra of several salts (LiCl, NaCl, KCl, MgCl2, CaCl2, Mg ...
... themselves, they cause notable changes in the water Raman signal. Therefore, in this study, we used a combination of Raman spectroscopy and computer modeling to analyze the magnesium hydration shell and origin of the signal. In the measured spectra of several salts (LiCl, NaCl, KCl, MgCl2, CaCl2, Mg ...
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... scattering was removed by a pair of notch filters which enabled a measurable spectral range above 150 cm−1. The scattered photons were focused on the entrance slit of a spectrometer and then dispersed by an imaging spectrograph (from Acton Research Corporation) housing a monochromator with a 0.5 m fo ...
... scattering was removed by a pair of notch filters which enabled a measurable spectral range above 150 cm−1. The scattered photons were focused on the entrance slit of a spectrometer and then dispersed by an imaging spectrograph (from Acton Research Corporation) housing a monochromator with a 0.5 m fo ...
Improved Intrapulse Raman Scattering Control via Asymmetric Airy
... pulses from numerical simulations with parameters that exactly match the experiments that follow. For such a tailleading Airy pulse [whose main lobe has a fast leading edge and a slow trailing edge; see Fig. 1(a)], the first generated Raman soliton captures a significant amount of energy due to its ...
... pulses from numerical simulations with parameters that exactly match the experiments that follow. For such a tailleading Airy pulse [whose main lobe has a fast leading edge and a slow trailing edge; see Fig. 1(a)], the first generated Raman soliton captures a significant amount of energy due to its ...
Full text - Simon Fraser University
... experimental result [18] of MoS2 on 285 nm SiO2 /Si near the peak in integrated intensity. Since it cannot explain the lower intensity for a monolayer, a transition downwards in y axis was made in the simulated result to better fit the experimental result (black solid). ...
... experimental result [18] of MoS2 on 285 nm SiO2 /Si near the peak in integrated intensity. Since it cannot explain the lower intensity for a monolayer, a transition downwards in y axis was made in the simulated result to better fit the experimental result (black solid). ...
Raman spectroscopy
Raman spectroscopy (/ˈrɑːmən/; named after Sir C. V. Raman) is a spectroscopic technique used to observe vibrational, rotational, and other low-frequency modes in a system. Raman spectroscopy is commonly used in chemistry to provide a fingerprint by which molecules can be identified.It relies on inelastic scattering, or Raman scattering, of monochromatic light, usually from a laser in the visible, near infrared, or near ultraviolet range. The laser light interacts with molecular vibrations, phonons or other excitations in the system, resulting in the energy of the laser photons being shifted up or down. The shift in energy gives information about the vibrational modes in the system. Infrared spectroscopy yields similar, but complementary, information.Typically, a sample is illuminated with a laser beam. Electromagnetic radiation from the illuminated spot is collected with a lens and sent through a monochromator. Elastic scattered radiation at the wavelength corresponding to the laser line (Rayleigh scattering) is filtered out, while the rest of the collected light is dispersed onto a detector by either a notch filter or a band pass filter.Spontaneous Raman scattering is typically very weak, and as a result the main difficulty of Raman spectroscopy is separating the weak inelastically scattered light from the intense Rayleigh scattered laser light. Historically, Raman spectrometers used holographic gratings and multiple dispersion stages to achieve a high degree of laser rejection. In the past, photomultipliers were the detectors of choice for dispersive Raman setups, which resulted in long acquisition times. However, modern instrumentation almost universally employs notch or edge filters for laser rejection and spectrographs either axial transmissive (AT), Czerny–Turner (CT) monochromator, or FT (Fourier transform spectroscopy based), and CCD detectors.There are a number of advanced types of Raman spectroscopy, including surface-enhanced Raman, resonance Raman, tip-enhanced Raman, polarised Raman, stimulated Raman (analogous to stimulated emission), transmission Raman, spatially offset Raman, and hyper Raman.