... Report Date : 30 JUN 1970. Pagination or Media Count : 52. Abstract : The absorption spectra of mercury in argon, krypton, xenon, and nitrogen ...

S FILE Copy SPECTROSCOPIC DETERMINATION OF THE ELECTROSTATIC ... SPECTROSCOPIC DETERMINATION OF THE ELECTROSTATIC ...

... Title : A SPECTROSCOPIC MEASUREMENT OF THE RESONANT ABSORPTION OF MICROWAVE ENERGY BY OXYGEN IN THE 2.5 ...

The following spectroscopic methods used to study of liquid crystals have been discussed: infrared, visible and ultraviolet absorption spectroscopy, fluorescence depolarization. Raman scattering, nuclear magnetic resonance and electron paramagnetic resonance. It has been shown, that using these methods the long-range orientational order in uniaxial liquid ...

The effect of varying short-chain alkyl substitution of the indole nitrogens on the spectroscopic properties of cyanine dyes was examined. Molar absorptivities and fluorescence quantum yields were determined for a set of pentamethine dyes and a set of heptamethine dyes for which the substitution of the indole nitrogen was varied. For ...

The photoacoustic technique can be used to quantify tissue absorption spectrum in a wide spectral range from visible to near infrared. As the photoacoustic signal intensity is proportional to tissue optical absorption coefficient and light fluence, it is important to know the local light fluence at the regional target in order to obtain the accurate ...

nutrient cycling, net primary production and litter decomposition is an important part in defining .... solar flux (wavelengths greater than 2400 rim). .... In our analysis we restricted the absorption features examined to avoid strong ...

The absorption spectra of mercury in argon, krypton, xenon, and nitrogen were obtained for deposit temperatures from 4K to 20K. The spectra exhibit multiple structure for argon, krypton, and xenon host but only a narrow band and a broad band for nitrogen ...

We have studied the spectroscopy of OH and have made accurate determination of many physical parameters which are needed in deducing OH concentrations from absorption and fluorescence measurements. The question of ozone interference in fluorescence measur...

To determine how the formation of color centers degrades performance, a series of spectroscopic experiments to measure electron paramagnetic resonance (EPR) absorption, transmission, and threshold were performed before and after irradiation. Low-temperatu...

Spectroscopic measurements of infrared molecular transitions in gas plumes are evaluated for their potential to yield a reliable remote sensing technique for determination of plume temperature. Under optically thin conditions, the ratio of intensities from two different CO2 transitions has no dependence on molecular concentration, but has sufficient ...

... Title : DETERMINATION OF SPECTROSCOPIC AND THERMODYNAMIC CONSTANTS FOR A SYSTEM OF 1:1 AND 2:1 COMPLEX EQUILIBRIUM ...

... Accession Number : ADA530645. Title : A Spectroscopic Determination of Scattering Lengths for Sodium Atom Collisions. ...

Microcalorimetric optical and infrared spectroscopy is a method of determining the spectral absorption of small quantities of materials over a wide range of incident wavelengths. In this paper, the first spectroscopic results for microcantilevers coated with Bacillus anthracis (BA) are presented. These results, for B. anthracis from ...

... The spectroscopic absorption of an aromatic compound on a ... behavior of aromatic compounds on soils at the ... to be characteristic of para-substituted ...

The sorption and desorption of Pb on RuO2 xH2O were examined kinetically and thermodynamically via spectroscopic and macroscopic investigations. X-ray absorption spectroscopy (XAS) was employed to determine the sorption mechanism with regard to identity of nearest atomic neighbo...

Spectroscopic instrumentation and the absorption characteristics of atmospheric gases are discussed in relation to the requirements of spectroscopic stratospheric experiments. Improvement in the spectral resolution, accuracy of the line parameters, and th...

Spectroscope absorption measurements of the stratospheric trace gases hydrogen chloride (HCl) and nitric (HNO3) using a Fourier transform infrared ...

Spectroscope absorption measurements of the stratospheric trace gases hydrogen chloride (HCl) and nitric (HNO3) using a Fourier transform infrared ...

... Title : In Situ Infrared Reflection Absorption Spectroscopic Characterization of Plasma Enhanced Chemical Vapor Deposited SiO2 Films. ...

Results are reported from a continuing program of research into the physics and spectroscopy of heated stack plumes. Simultaneous thermocouple and spectrometer measurements are used to study sideways-directed plumes from an internal combustion engine and a propane-burning plume generator. A previously-reported result, that the ratio of optically thin signals from two CO2 transitions can be used to ...

Results of preliminary X-ray absorption spectroscopic studies of the Desulfovibrio gigas enzyme indicate that the nickel is reduced from Ni(III) to Ni(II) upon H/sub 2/ reduction of the oxidized enzyme and that the ligands are bound to the nickel through the S atoms. Hydrogenase from Desulfovibrio gigas exhibited a single bond on disc acrylamide gel ...

Ultraviolet-visible absorption spectroscopic studies of C[sub 60] vapor were carried out in the temperature range 400 [degree]C--720 [degree]C. The enthalpy of sublimation (180[plus minus]10 kJ/mol) was obtained through the use of the Clausius--Clapeyron equation.

The orbital radial velocity semi-amplitude of the binary star system LMC X-4 primary was determined to be 37.9 + or - 2.4 km/s from measurements of the hydrogen absorption lines. The semi-amplitude of the He I and He II absorption lines are consistent wit...

Spectral absorption coefficients and fluorescence quantum efficiencies were determined for humic substances from a variety of sources. Specific absorption coefficients, K(h), for humic substances at wavelengths lambda from 300 to 500 nm can be closely described by the relation Ae...

The D2O absorption spectrum recorded with a selective modulation Girard spectrometer in the region of 3690-4190 cm-1 (resolution ~0.07 cm-1) has been analyzed. Based on the fitting of experimental data the spectroscopic parameters of the vibrational state (011) have been determined and the parameters of the vibrational states (110) and ...

In this paper, we determined the ratio of C13/C12 of methane in slurry gas from oil wells by the method of laser frequency modulation absorption spectroscopy that has many advantages such as high precision, high spectroscopic resolution and rapidly and simply dealing with samples. This technique provided us with a subsidiary method for ...

A new application for cavity ring-down spectroscopic (CRDS) technique using a pulsed polarized light source has been developed in the absorption measurement of liquids for ``colorless'' organic compounds using both a single sample cell and double sample cells inserted in an optical cavity at Brewster angle. At present an experimental capability of ...

... ULTRAVIOLET BAND RE-ASSIGNMENT FOR ANILINE AND ITS DERIVATIVES. ... of the ultraviolet absorption spectrum for anilines and derivatives ...

... COMPLEX COMPOUNDS, SPECTROSCOPY, STRUCTURAL PROPERTIES, ABSORPTION, PYRIDINES, PYRAZOLES, INDOLES, BRIDGES ...

... of gases in the atmosphere or elsewhere. ... in which a central control unit is ... ABSORPTION, AUSTRALIA, MULTIPLEXING, SIGNAL GENERATION. ...

A novel approach has been proved to quickly and non-invasively determine the optical properties of human skin in vivo. It is based on the diffuse reflectance approximation model and subjected to the well established library of absorption spectra of water and hemoglobin. Under the nonlinear least-square algorithm, fitting the measured spectra in the range ...

A full IR, UV-Vis, FIR, spectroscopic analysis on substituted porphyrin iron, manganese, cobalt, copper and Zinc complexes was performed, and the spectroscopic patterns were found for the metalloporphyrin compounds with various structures. Base on molecular structures theory, the reasons for the spectroscopic patterns were discussed ...

The mechanism of formaldehyde-protein interactions was investigated by determining the effects of formaldehyde on the common protein bovine serum albumin (BSA). The effects at the molecular level were determined by fluorescence, ultraviolet absorption, and circular dichroism (CD) spectrometry. Formaldehyde could decrease the amount of ...

The flavoquinone dyes 10-phenyl-isoalloxazine-3-acetic acid ethyl ester (1) and 10-(4-bromo-phenyl)-3-methyl-isoalloxazine (2) in dichloromethane, acetonitrile, and methanol are characterized by absorption and emission spectroscopy. Absorption cross-section spectra, stimulated emission cross-section spectra, fluorescence quantum distributions, quantum ...

A spectroscopic study of 3-step resonance ionization was performed for atomic gadolinium. Many high-lying odd states and autoionizing states were identified. The ionization potential of gadolinium was determined to be 49601.44{plus_minus}0.30cm{sup {minus}1}. Photo-absorption cross-sections were measured for many transitions, enabling ...

Plasma pressure under various conditions is studied for applications in metallurgy. Spectroscopic methods of plasma temperature determination are described. Various surface coverings are tested to determine their laser energy absorption, their shock wave ...

The objective of our work is to apply two-photon polarization spectroscopy as a new calibration method for the determination of two-photon excitation cross-sections of noble gases, like Xe and Kr, which are commonly used for calibrations of MP-LIF techniques in other laboratories.

We report on a new optical implementation of primary gas thermometry based on laser-absorption spectrometry in the near infrared. The method consists in retrieving the Doppler broadening from highly accurate observations of the line shape of the R(12) ?1+2?20+?3 transition in CO2 gas at thermodynamic equilibrium. Doppler width measurements as a function of gas temperature, ...

A method is presented for determining molybdenum in plant tissue and blood plasma by flame and flameless atomic absorption spectroscopy (AAS). The samples are digested with HNO3-HCIO4, and the metal is separated by chelation, extracted into methyl isobutyl ketone, and analyzed by AAS. Recoveries of molybdenum from fortified samples ranged from 92.0 to ...

A method is presented for determining molybdenum in plant tissue and blood plasma by flame and flameless atomic absorption spectroscopy (AAS). The samples are digested with HNO/sub 3/-HClO/sub 4/, and the metal is separated by chelation, extracted into methyl isobutyl ketone, and analyzed by AAS. Recoveries of molybdenum from fortified samples ranged from ...

PRECISION RADIAL VELOCITIES OF DOUBLE-LINED SPECTROSCOPIC BINARIES WITH AN IODINE ABSORPTION CELL October 15; accepted 2005 February 25 ABSTRACT A spectroscopic technique employing an iodine absorption precision velocities of the spectroscopic double-lined binary HD 4676 to dem- onstrate

Synthetic surfactants, for their ability to mingle with and transform chemicals more toxic in nature such as petroleum products, oils, pesticides, and chlorinated hydrocarbons into substances that easily permeate and move through the hydrosphere into water reservoirs and other exposure pathways, pose a grave danger to water quality control. This paper reviews predominantly the spectrophotometric ...

In this paper, the latest results on the measurement of the Boltzmann constant k B, by laser spectroscopy of ammonia at 10?m are presented. The Doppler absorption profile of a rovibrational line of an NH3 gas sample at thermal and pressure equilibrium is measured as accurately as possible. The absorption cell is placed inside a large 1 m3 thermostat filled ...

Spectroscopic Databases to Support Extrasolar Planet Modeling ... Line List Database: Brown and Butler have worked to collect line lists and absorption ...

We report a procedure for temperature and water vapour concentration measurements in an unsteady-state combustion zone using diode laser absorption spectroscopy. The procedure involves measurements of the absorption spectrum of water molecules around 1.39 {mu}m. It has been used to determine hydrogen combustion parameters in M = 2 gas ...

We report a procedure for temperature and water vapour concentration measurements in an unsteady-state combustion zone using diode laser absorption spectroscopy. The procedure involves measurements of the absorption spectrum of water molecules around 1.39 ?m. It has been used to determine hydrogen combustion parameters in M = 2 gas ...

S>Methods are described for the determination of major and minor chemical constituents in fine-grained sedimentary rocks. They include wet- chemical methods, radiometric and flame-photometric methods, absorption and emission spectroscopic methods, and fluorescent x-ray procedures. The major elements are ...

Methods are described for the determination of major and minor chemical constituents in fine-grained sedimentary rocks. They include wet-chemical, radiometric and flame-photometric methods, as well as absorption and emission spectroscopic and fluorescent x-ray procedures. The major elements are ...

The location of gases that are not visible to the unaided human eye can be determined using tuned light sources that spectroscopically probe the gases and cameras that can provide images corresponding to the absorption of the gases. The present invention is a light source for a backscatter absorption gas imaging ...

In this work, fast and reliable spectroscopic methods in combination with chemometric tools were developed for simultaneous determination of Acetylsalicylic Acid, Acetaminophen and Caffeine in commercial formulations. For the first-order multivariate calibration method (PLS-1), calibration and validation sets were constructed with 23 and 10 samples ...

The estimation of residual interactions by spectroscopic data on the lower states of nuclei determines, for average nuclei with A < 70, the position of a giant resonance in agreement with experiment, provided the calculations are based on shell theory. An analysis is performed for Li/sup 7/, C/sup 12/ , and C/ sup 13/ as well as Mg/sup 24/ and ...

Progress is given on work on: cross section measurements in the transmission window regions of the Schumann-Runge bands of oxygen; the determinations of predissociation linewidths; the theoretical calculation of band oscillator strengths of the Schumann-Runge absorption bands of O-16O-18; the determination of molecular ...

The sensitivity of atomic-absorption and flame-emission determination of lanthanides and yttrium is improved by a factor of 2-5 when an absolute ethanol solution of the perchlorate of the metal (instead of an aqueous solution) is aspirated into a nitrous oxide-acetylene flame. Based on this, a method has been developed for accurate ...

We have obtained high-resolution Ca II and Na I absorption-line spectra toward 68 OB stars in the direction of the Vela supernova remnant. The stars lie at distances of 190-2800 pc as determined by Hipparcos and spectroscopic parallax estimations. The presence of high-velocity absorption attributable to the remnant ...

A three-dimensional spectral radiation transport model has been developed for assessing the impact of burning deeply cleaned coals on heat absorption patterns in pulverized coal (PC) furnaces. Spectroscopic data are used for calculating the absorption coefficients of participating gases. Mie theory is invoked for ...

Synchrotron radiation in the 1060 to 2000 A region was used to measure the average absorption and fluorescence cross sections of NO and to determine approximate photodissociation quantum yields. Several vibrational levels of the D(2) sigma(+), E(2) sigma(+), and B(2) delta states have high fluorescence quantum yields. The C(2) and B(2) states do not ...

The absorption spectra of 12 rare earth ions (Ce(3+) to Yb(3+)) in silica glass were determined at wave lengths of 0.25-5.0 microns using glass of the basic composition 25Na2O.75SiO2 plus 0.24Tr2O3 where Tr is the transition element. The specific peak abs...

The absorption spectra and the laser output energies were determined for radiation-colored YAG:Nd/sup 3 +/ crystals. Experimental and simplified theoretical relationships were derived between the change in the laser output energy and the absorption by induced color centers. The change in the output energy calculated from the ...

An electrical signal, resulting from discrete optical absorptions, has been observed for a variety of elements, including several for which such an effect had not been previously reported. In the present case, the effect is observed as a change in the voltage across a gas discharge tube produced by irradiation with a laser tuned to the wavelength of a transition of a species ...

Quantitative IR- and Raman spectroscopic determinations of four cephalosporin antibiotics in six solid binary mixtures have been conducted. This is a new approach for spectroscopic determination of these antibiotics, since the corresponding quantitative analysis in solution only has been reported so far. The ...

There is disclosed an integrated spectrometer for chemical analysis by evanescent electromagnetic radiation absorption in a reaction volume. The spectrometer comprises a noninteractive waveguide, a substrate, an entrance grating and an exit grating, an electromagnetic radiation source, and an electromagnetic radiation sensing device. There is further disclosed a chemical ...

Molecular Orbltal Treatment The Huckel molecular orbital (HMO)method makes sev- eral assumptions which found by plotting the HMO AE's (abscissa) versus the observed AE's (ordinate) and determining the expkimerh transition energiesA d the theoretical HMO transition energies is given in Table 5. Table 4. HOMO

A determination was made of several important spectroscopic and thermodynamic properties of three oxides of nitrogen which are important in atmospheric chemistry, NO2, NO3 and N2O5. In the first phase, a redetermination was made of the absorption cross se...

We report Raman scattering and visible to near-infrared absorption spectra of solid hydrogen under static pressure up to 285 GPa between 20 and 140 K. We obtain pressure dependences of vibron and phonon modes consistent with results previously determined to lower pressures. The results indicate the stability of the ordered molecular phase III to the ...

Several oxidation states of neptunium and plutonium, Pu(III), Pu (IV), Pu(VI), Np(IV), Np(V) and Np (VI), were studied in glasses prepared by a sol-gel technology. The oxidation state of these actinides was determined primarily by absorption spectrometry ...

The first quantitative measurement of photoabsorption in the region determining the Rosseland and Planck mean opacities is obtained for a well-characterized, radiatively heated iron plasma using new techniques and instrumentation. The plasma density and temperature are simultaneously constrained with high accuracy, allowing unambiguous comparisons with opacity models used in ...

The high-resolution infrared absorption spectra of NH(+) were observed in gas phase with a difference frequency laser spectrometer system. A detailed analysis was performed to unravel the perturbation between the X 2Pi and a 4Sigma(-) states. The precise spectroscopic constants were determined. The term values for the v = 0 and 1 ...

It is shown that kinetic studies in discharges can be performed by applying narrow well-defined voltage excitation pulses, enabling rate constants for chemical reaction and vibrational relaxation rates to be determined. Infrared absorption spectra can be detected at different delay times, providing simultaneous kinetic and ...

Determinations of ultraviolet absorption changes and fluorescence decay kinetics in a PS (Photon System) field were carried out for charge and energy transfer in PS2 enriched membrane fragments. A test impulse spectrometer was developed for measuring time...

The influence of the acidity of solutions of methionine on methionine interaction with KB-2 and KB-4 carboxyl cation exchangers in the protonated and deprotonated forms was studied by the calorimetric, sorption, and spectroscopic methods. It was found that nonexchange methionine absorption occurred from acid solutions, and mixed ion exchange and ...

Diode laser heterodyne techniques have been used to obtain the frequencies of 55 ir absorption lines of 32S16O2. From these data and from previous microwave and millimeter wave measurements, new spectroscopic constants for the ?1 band have been determined. The new constants have been used to predict new optically pumped submillimeter ...

The refractive index N = n + ik of the protein bovine carbonic anhydrase (BCA) adsorbed in porous silicon layers is determined using infrared spectroscopic ellipsometry. Five absorption bands in the amide region are resolved. The distribution of the protein inside the porous matrix is modelled and it is found that more BCA per internal ...

Atomic, molecular, and optical processes play fundamental roles in regulating the evolution of star-forming regions in galaxies, and of accreting black holes in galaxy nuclei. I present a discussion of the essential physics and chemistry of interstellar photon-dominated regions (PDRs) and X-ray dominated regions (XDRs). In such regions, intense radiation fields determine the ...

spectroscopic study is performed on Er3+ 4f11 ions doped in polycrystalline ceramic garnet Y3Al5O12 YAG ceramic and single-crystal YAG samples were measured. From the radiative lifetimes determined from the JO. The comparative study of Er3+ 4f11 ions performed suggests that polycrystalline ceramic YAG is an excellent

The solvatochromic responses of uric acid (Ua), 6-amino-2-thiouracil (ATU) and a series of their complexes dissolved in ten solvents of different polarity have been measured. The solvent-dependent UV/Vis spectroscopic absorption maxima, ?(max), are assigned to the corresponding electronic transitions and analyzed using SPSS program, regression analysis and ...

X-ray fluorescence spectroscopy is a widely used method for determining the electronic configuration and local structure of dilute species with high sensitivity. In the dilute limit, and for thin films, the X-ray fluorescence signal is directly proportional to the atomic sub-shell absorption coefficient. However, for concentrated samples, the ...

An x-ray spectroscopic system for determining the presence of a particular element in a body of matter is patented. The determination can be made quickly and reliably without altering the body. X rays of 2 different wavelengihs are used, one slightly longer and one slightly shorter than the wavelength of an ...

The phenothiazine phenylene isoalloxazine dyad, 3-methyl-10-[4-(10-heptyl-10H-phenothiazin-3-yl)-phenyl]-10H-benzo[g]pteridine-2,4-dione, dissolved in either dichloromethane or acetonitrile is characterized by absorption and emission spectroscopy. Absorption cross-section spectra, stimulated emission cross-section spectra, fluorescence quantum ...

For decades a gravimetric method has been common standard for the determination of heat seal lacquers on aluminum blister foils. With the availability of appropriate techniques such as interferometric, infrared reflection absorption spectroscopic (IRRAS), beta backscatter, impedance spectroscopic and eddy current ...

The authors use orthogonal experiment planning to define the optimum form of buffer and to establish the effects of sample composition since there are high levels of cation and anion interference in the atomic-absorption determination of molybdenum. A spectroscopic buffer has been identified (HCLO/sub 4/ + NH/sub 4/Cl mixture), which ...

The temperature in the strong absorbing cloud surrounding the luminous propellant gas near the mouth of a rifle was measured as a function of time using emission and absorption spectroscopic techniques. The strong absorption in the cold part of the gas cl...

... or Media Count : 32. Abstract : Spectroscopic measurements of electron and ion temperatures in steady-state helium and argon plasmas are ...

... resonance (EPR), and (7)Li solid state nuclear magnetic resonance (NMR ... extended x-ray absorption fine structure shows that the local symmetry of ...

Absorption and Radiation Activities and Demonstration Video ... This activity investigates the effect surface color has on heat absorption and radiation. ... unit calls for students to build simple spectroscopes to study visible light. ...

... Accession Number : AD0614085. Title : MODEL ATMOSPHERES DETERMINED BY ABSORPTION OF SOLAR RADIATION,. ...

... Title : EXPERIMENTAL DETERMINATION OF THE ABSORPTION COEFFICIENTS OF BREMSSTRAHLUNG IN STEEL FOR BETATRON ...

A spectroscopic method is suggested for the quantitative determination of lignin in cellulose-containing materials, which is based on taking a differential spectrum of the test material relative to a standard (cotton cellulose). Test samples are prepared in the form of variable thickness films for ease of compensation. Lignin content is ...

... GLASS, IONS, SYMPOSIA, AMORPHOUS MATERIALS, LIGHT TRANSMISSION, ABSORPTION SPECTRA, LUMINESCENCE, SAMARIUM, ...