Fiber-optic ring-down spectroscopy using a tunable picosecond gain-switched diode laser Applied Physics B
... impossible once the free spectral range of the cavity is smaller than the linewidth of even a cw-laser. These limitations apply to cavities that consist of, e.g., very long single-mode fiber loops or multimode fiber loops such as those presented in this article. In these cases, using picosecond puls ...
... impossible once the free spectral range of the cavity is smaller than the linewidth of even a cw-laser. These limitations apply to cavities that consist of, e.g., very long single-mode fiber loops or multimode fiber loops such as those presented in this article. In these cases, using picosecond puls ...
SPECTROSCOPIC MANIFESTATION OF DYE PAIR
... (SRSF) was the purpose of the given research. SRSF nanometrical thickness were prepared by the sol-gel technology with use the surfactant Pluronic P123.The hydrophobic nature of the surfactant can be utilized for the strong solubilization of organic compounds and the one-dimensionality enables us to ...
... (SRSF) was the purpose of the given research. SRSF nanometrical thickness were prepared by the sol-gel technology with use the surfactant Pluronic P123.The hydrophobic nature of the surfactant can be utilized for the strong solubilization of organic compounds and the one-dimensionality enables us to ...
Fabrication and characterization of silicone-based - lammp
... six laser diodes at different wavelengths which scans 125 frequencies between 50 and 250 MHz, and a broadband NIR light source.[5] The detection of this combination at two separations is a self-calibrating method[6] and provides fitted absorption and reduced scattering values at discrete points betw ...
... six laser diodes at different wavelengths which scans 125 frequencies between 50 and 250 MHz, and a broadband NIR light source.[5] The detection of this combination at two separations is a self-calibrating method[6] and provides fitted absorption and reduced scattering values at discrete points betw ...
Absorption Spectra and Photolysis of Methyl Peroxide in Liquid and
... acidic DNPH solution to form the corresponding hydrazone. After neutralizing the hydrazone solution with potassium hydroxide, a deep red color develops. The absorbance at 480 nm is proportional to the concentration of carbonyl groups in solution; we used several different 2-butanone solutions to cal ...
... acidic DNPH solution to form the corresponding hydrazone. After neutralizing the hydrazone solution with potassium hydroxide, a deep red color develops. The absorbance at 480 nm is proportional to the concentration of carbonyl groups in solution; we used several different 2-butanone solutions to cal ...
Naphtyl-imidazo-anthraquinones as novel colorimetric
... may be tailored by a proper choice of donor functions, able to coordinate a metal ion, and the molecular framework is determined by the target metal ion. Considering colorimetric/fluorimetric sensors, a colorimetric sensor has the advantage of the straightforward and rapid naked-eye detection throug ...
... may be tailored by a proper choice of donor functions, able to coordinate a metal ion, and the molecular framework is determined by the target metal ion. Considering colorimetric/fluorimetric sensors, a colorimetric sensor has the advantage of the straightforward and rapid naked-eye detection throug ...
An Introduction to Pulsed Dye Lasers Introduction Light amplification
... bounces off the mirrors back into the cuvet. The reflected light can then bring about stimulated emission. If the stimulated emission is intense enough laser emission will result, as molecules rapidly drop back into their ground states. Each time a beam of light passes through the excited dye soluti ...
... bounces off the mirrors back into the cuvet. The reflected light can then bring about stimulated emission. If the stimulated emission is intense enough laser emission will result, as molecules rapidly drop back into their ground states. Each time a beam of light passes through the excited dye soluti ...
Organometallic Synthesis and Spectroscopic Characterization of
... giant Faraday rotation effects near the band edge.5 The preparation of doped QDs should allow the study of the effects of threedimensional quantum confinement on well-known bulk DMS properties. A report by Awschalom and co-workers6 of changes in the magnetic behavior of thin CdMnTe films as the laye ...
... giant Faraday rotation effects near the band edge.5 The preparation of doped QDs should allow the study of the effects of threedimensional quantum confinement on well-known bulk DMS properties. A report by Awschalom and co-workers6 of changes in the magnetic behavior of thin CdMnTe films as the laye ...
Fluorescence Fidelity Depends on Filters
... (ROIs) where the target fluorophore, which emits fluorescence photons under the appropriate excitation, is located and the surrounding region where no target fluorophore is present. For the case of fluorescence microscopy, images with SNR > 20 are considered acceptable, with values of SNR > 40 desir ...
... (ROIs) where the target fluorophore, which emits fluorescence photons under the appropriate excitation, is located and the surrounding region where no target fluorophore is present. For the case of fluorescence microscopy, images with SNR > 20 are considered acceptable, with values of SNR > 40 desir ...
Absorption Measurements in Microfluidic Devices using Ring-down Spectroscopy
... then fed into a fast lock-in amplifier (Stanford Research Systems, SR 844) and referenced to the driving current of the laser diode. To reduce radio frequency interference, all the cables are shielded. The laser dye ADS805(American Dye Source) was used without further purification and had an absorp ...
... then fed into a fast lock-in amplifier (Stanford Research Systems, SR 844) and referenced to the driving current of the laser diode. To reduce radio frequency interference, all the cables are shielded. The laser dye ADS805(American Dye Source) was used without further purification and had an absorp ...
IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736.
... Structural and Spectroscopical Studies for a Complex Macromolecule (hGH) a chaotropic agent that causes hGH denaturation by solvating the non polar groups in the interior of the hormone. The urea molecules disrupt the hydrophobic interactions that normally stabilize the native conformation and form ...
... Structural and Spectroscopical Studies for a Complex Macromolecule (hGH) a chaotropic agent that causes hGH denaturation by solvating the non polar groups in the interior of the hormone. The urea molecules disrupt the hydrophobic interactions that normally stabilize the native conformation and form ...
An ultrafast reconfigurable nanophotonic switch using
... between optimization with and without pump. For optimization without pump, we see for this particular configuration the suppression of the shaped field beginning around zero time delay with a maximum effect of (20±2)% at 3.5 ps. For optimization with pump on, we find that the dynamics of the peak to ...
... between optimization with and without pump. For optimization without pump, we see for this particular configuration the suppression of the shaped field beginning around zero time delay with a maximum effect of (20±2)% at 3.5 ps. For optimization with pump on, we find that the dynamics of the peak to ...
Ligand to Ligand Charge Transfer in
... and 488.0 nm from an argon ion laser. Raman spectra were recorded at room temperature using argon ion (514.5 nm) excitation, and resonance Raman spectra were obtained at room temperature using the 457.9 nm line of the same laser. The laser beam was focused on the samples with a 150 mm focal length l ...
... and 488.0 nm from an argon ion laser. Raman spectra were recorded at room temperature using argon ion (514.5 nm) excitation, and resonance Raman spectra were obtained at room temperature using the 457.9 nm line of the same laser. The laser beam was focused on the samples with a 150 mm focal length l ...
Optical Properties of Solids
... resonant with the transition frequencies of the atoms in the medium. In this case, the beam will be attenuated as it progresses. The transmission of the medium is clearly related to the absorption, because only unabsorbed light will be transmitted. Selective absorption is responsible for the coloura ...
... resonant with the transition frequencies of the atoms in the medium. In this case, the beam will be attenuated as it progresses. The transmission of the medium is clearly related to the absorption, because only unabsorbed light will be transmitted. Selective absorption is responsible for the coloura ...
laser spectroscopy
... The output beam from the laser is split into three beams, two less intense probe beams and a more intense pump beam, at the thick beamsplitter. The two probe beams pass through the rubidium cell from top to bottom, and they are separately detected by two photodiodes. The two photodiodes form a balan ...
... The output beam from the laser is split into three beams, two less intense probe beams and a more intense pump beam, at the thick beamsplitter. The two probe beams pass through the rubidium cell from top to bottom, and they are separately detected by two photodiodes. The two photodiodes form a balan ...
Resolution-and throughput-enhanced spectroscopy using high
... such as the size and shape of the entrance aperture, the optical characteristics of the dispersive element, the optical characteristics of the collimating optics the focusing optics, and the size and shape of the detector’s pixels. In particular, the size of the entrance aperture (e.g., width of sli ...
... such as the size and shape of the entrance aperture, the optical characteristics of the dispersive element, the optical characteristics of the collimating optics the focusing optics, and the size and shape of the detector’s pixels. In particular, the size of the entrance aperture (e.g., width of sli ...
Ultrafast electronic dynamics in polyatomic molecules studied using
... laser pulses is not intense enough to create filamentation, cooperative interaction between the two-colour fields and the gas medium can induce filamentation propagation [6]. The intensity clamping and mode cleaning effects in filamentation provide stable and spatially clean output pulses [8]. While ...
... laser pulses is not intense enough to create filamentation, cooperative interaction between the two-colour fields and the gas medium can induce filamentation propagation [6]. The intensity clamping and mode cleaning effects in filamentation provide stable and spatially clean output pulses [8]. While ...
Picosecond Flash Photolysis of Carbonyl Complexes ... Ruthenium(II} Porphyrin Cation Radicals
... 1r cation radicals Ru(OEP+·)CO(L): L = EtOH (4a). py (4b). 1m (4c). Br- (4d). Excitation with 35-ps flashes at 532 nm results in the formation and decay of transient states having lifetimes less than the flash duration. The transient lifetimes for 2A!u ground-state 1r cation radicals are shorter tha ...
... 1r cation radicals Ru(OEP+·)CO(L): L = EtOH (4a). py (4b). 1m (4c). Br- (4d). Excitation with 35-ps flashes at 532 nm results in the formation and decay of transient states having lifetimes less than the flash duration. The transient lifetimes for 2A!u ground-state 1r cation radicals are shorter tha ...
A nanometer notch filter with high rejection and throughput
... less than lo-nm bandwidth;lY2in the caseof ruby, the presence of two adjacent absorption lines (Rl and R2) limits the bandwidth to a few nanometers. Rejection based on grating spectrometers3can also be used but with a much lower throughput than available from amplitude division devices,such as Fabry ...
... less than lo-nm bandwidth;lY2in the caseof ruby, the presence of two adjacent absorption lines (Rl and R2) limits the bandwidth to a few nanometers. Rejection based on grating spectrometers3can also be used but with a much lower throughput than available from amplitude division devices,such as Fabry ...
precipitate - UniMAP Portal
... Example for Volatilisation:The analyte or its decomposition products are volatilised at a suitable temperature. The volatile product is then collected and weighed, i.e. the mass of the product is indirectly determined from the loss in mass of the sample. ...
... Example for Volatilisation:The analyte or its decomposition products are volatilised at a suitable temperature. The volatile product is then collected and weighed, i.e. the mass of the product is indirectly determined from the loss in mass of the sample. ...
Chapter 4: Experimental Techniques
... The metal being analysed is not usually in its elemental form, and so the first step is digestion (decomposition) of the sample and of a series of standards. The standards contain known concentrations of the metal being analysed and are used to construct a calibration curve (see below). The atomic a ...
... The metal being analysed is not usually in its elemental form, and so the first step is digestion (decomposition) of the sample and of a series of standards. The standards contain known concentrations of the metal being analysed and are used to construct a calibration curve (see below). The atomic a ...
ХИМИЯ НА АНГЛИЙСКОМ ЯЗЫКЕ
... 1.38. A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100-mL volumetric flask and diluted to volume with distilled water. A 10-mL aliquot of the soluti ...
... 1.38. A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100-mL volumetric flask and diluted to volume with distilled water. A 10-mL aliquot of the soluti ...
Excited state behaviour of substituted dipyridophenazine Cr(III)
... can be potentially exploited for applications such as solar energy converters and optoelectronics,1–3 molecular light switches4–6 and phototherapeutic agents.7–9 d6 complexes such as those of ruthenium(II) or rhenium(I) have been extensively investigated as an advantage of these compounds is that th ...
... can be potentially exploited for applications such as solar energy converters and optoelectronics,1–3 molecular light switches4–6 and phototherapeutic agents.7–9 d6 complexes such as those of ruthenium(II) or rhenium(I) have been extensively investigated as an advantage of these compounds is that th ...
Theoretical and experimental investigation of the second
... when the pH of the medium is increased. In general terms, the absorption bands are consistent with the existence of -* electronic transitions.12 One can see in Fig. 2共a兲 that for an aqueous solution, the absorption spectrum at pH ⬃6.6共⬎pKa兲 is characterized by two absorption bands centered at ⬇460 ...
... when the pH of the medium is increased. In general terms, the absorption bands are consistent with the existence of -* electronic transitions.12 One can see in Fig. 2共a兲 that for an aqueous solution, the absorption spectrum at pH ⬃6.6共⬎pKa兲 is characterized by two absorption bands centered at ⬇460 ...
Optical losses
... follow a distribution law throughout the fiber. However, they can be minimized by having low thermodynamic density fluctuations. A small part of the scattered light may scatter backward, propagating in the opposite direction. This backscattering has important characteristics and may be used for meas ...
... follow a distribution law throughout the fiber. However, they can be minimized by having low thermodynamic density fluctuations. A small part of the scattered light may scatter backward, propagating in the opposite direction. This backscattering has important characteristics and may be used for meas ...
Atomic absorption spectroscopy
Atomic absorption spectroscopy (AAS) is a spectroanalytical procedure for the quantitative determination of chemical elements using the absorption of optical radiation (light) by free atoms in the gaseous state.In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analyzed. AAS can be used to determine over 70 different elements in solution or directly in solid samples used in pharmacology, biophysics and toxicology research.Atomic absorption spectroscopy was first used as an analytical technique, and the underlying principles were established in the second half of the 19th century by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, both professors at the University of Heidelberg, Germany.The modern form of AAS was largely developed during the 1950s by a team of Australian chemists. They were led by Sir Alan Walsh at the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Division of Chemical Physics, in Melbourne, Australia.Atomic absorption spectrometry has many uses in different areas of chemistry such as: Clinical analysis: Analyzing metals in biological fluids and tissues such as whole blood, plasma, urine, saliva, brain tissue, liver, muscle tissue, semen Pharmaceuticals: In some pharmaceutical manufacturing processes, minute quantities of a catalyst that remain in the final drug product Water analysis: Analyzing water for its metal content.↑ ↑ ↑