... Title : The Polarized Absorption Spectroscopy as a Novel Method for Determining the Orientational Order of Poled Nonlinear Optical Polymer Films. ...

... Current laboratory methods employ either atomic absorption spectroscopy or inductively coupled plasma spectroscopy . ...

Contents: Theory of atomic absorption measurements; Atomic-absorption spectrophotometers; The preparation of absorbing media. General principles; Flames; Graphite cuvettes; and Some special applications of the atomic-absorption method.

... Descriptors : *INSTRUMENTATION, *ATOMIC SPECTROSCOPY, *ABSORPTION SPECTRA, OPTICS, AUXILIARY, QUANTITATIVE ANALYSIS ...

The results of a single-laboratory study of osmium analytical methods are described. The methods studied include direct-aspiration atomic absorption spectroscopy (EPA Method 7550), furnace atomic absorption spectroscopy and inductively coupled plasma ...

The method of flash absorption spectroscopy has been applied to the primary processes of photosynthesis in green plants.

Melanin absorption spectroscopy: new method for noninvasive skin investigation and melanoma between malignant melanoma and dysplastic nevi in vivo. These preliminary results are confirmed both to melanoma in situ and then to malignant mela- noma is reflected in the melanin absorption spectra. Our

The results of a single-laboratory study of osmium analytical methods are described. The methods studied include direct-aspiration atomic absorption spectroscopy (EPA Method 7550), furnace atomic absorption spectroscopy and inductively coupled plasma ...

A method for determining high concentrations of sodium by Atomic Absorption Spectroscopy (AAS) was developed. Parameter values were set and an interfering ion study completed. This technique utilizing sodium atomic absorption of zinc ion emission from zin...

... Title : An Efficient Method for Solving Quantum Liouville Equation: Applications to Electronic Absorption Spectroscopy. ...

A direct graphite furnace atomic absorption spectroscopy method for the analysis of beryllium in drinking water has been derived from a method for determining beryllium in urine. Ammonium phosphomolybdate and ascorbic acid were employed as matrix modifiers. The matrix modifiers s...

Feb 9, 2005 ... ping absorption spectra using photoacoustic spectroscopy. ... Photoacoustic spectroscopy (PAS) is an analytical method ...

The method of flash adsorption spectroscopy has been applied to the primary processes of photosynthesis in green plants.

... The Ultraviolet Reflection-Absorption Spectroscopy (UVRAS) method has important advantages for in-situ studies of processing environments. ...

... Title : Investigation of Molecule-Surface Interactions With Overtone Absorption Spectroscopy and Computational Methods. ...

Diode laser absorption spectroscopy provides a direct method of determinating species concentration and local gas teniperaftue in combustion flames. ...

An experiment for determination of calcium in cereal using two-increment standard addition method in conjunction with flame atomic absorption spectroscopy (FAAS) is demonstrated. The experiment is intended to introduce students to the principles of atomic absorption spectroscopy giving them ...

... high resolution IR absorption spectroscopy in ... Descriptors : *HYDROGEN, *ABSORPTION, *SOLID ... PROPERTIES, INFRARED SPECTROSCOPY ...

The concentration of specific minerals in foods can be determined by a variety of methods. The aim of this lab is to acquaint you with the use of atomic absorption spectroscopy (AAS) and atomic emission spectroscopy (AES) for that purpose. The specific type of AES will be inductively coupled plasma-atomic emission ...

An apparatus for performing scanning tunneling optical absorption spectroscopy includes a scanning tunneling microscope tip positioned at a tunneling distance over a surface portion of a sample to be analyzed, biasing apparatus for producing an electric p...

Infrared reflection-absorption spectroscopy of films on surfaces of transparent or weakly absorbing semiconductor and dielectric substrates is analyzed theoretically, the purpose being to establish the conditions for maximum sensitivity of this method. Th...

The status of current techniques and methods of atomic absorption (AA) spectroscopy (flame, hybrid, and furnace AA) is discussed, including limitations. Technological opportunities and how they may be used in AA are also discussed, focusing on automation, microprocessors, continuum AA, hybrid analyses, and others. (Author/JN)

An apparatus for calorimetric absorption spectroscopy (CAS) and calorimetric transmission spectroscopy (CTS) at temperatures up to 1.3K, including computer control, data acquisition, and data evaluation, was built. At 1.3K, products of absorption coeffici...

Terahertz absorption spectra and dispersion of biologically important substances such as sugar, water, hemoglobin, lipids and tissues are studied. The characteristic absorption lines in the frequency range of a terahertz spectrometer (0.1�3.5 THz) are found. The refraction indices and absorption coefficients of human tooth enamel and ...

A new method for fission-track detection by means of absorption spectroscopy is presented. Application of the method to the investigation of the annealing behavior shows the following result: Annealing of fission tracks in apatite crystals containing fossil tracks causes a decrease of the characteristic ...

Work to develop novel advanced laser spectroscopy plasma diagnostic methods is described. The methods are based on observing the doppler shift in the absorption liners of ionic species. Two methods under study are Velocity Modulated Laser Spectroscopy and...

Data were obtained which will provide a test of the accuracy of the differential absorption method for trace contaminant detection in many-component gas mixtures. The necessary accurate absorption coefficient determinations were carried out for several ga...

...For Aluminum, Method 202.1 (Atomic Absorption, Direct Aspiration) replace the Precision...for Trace Methods in water by Atomic Absorption Spectroscopy (Direction Aspiration...for Trace Methods in Water by Atomic Absorption ...

Some methods are outlined by which surface-enhanced Raman spectroscopy (SERS) and infrared reflection-absorption spectroscopy (IRRAS) can be applied to gain mechanistic information for multistep electrode processes involving adsorbed species. Emphasis is ...

As performance levels for sophisticated electronic materials and device processing increase so to does the demand for versatile methods for on-line real time sensing of many process parameters. To that end we have developed a series of tunable semiconductor laser spectrometers for use in detection schemes of gas phase chemical species via infrared ...

to be 31 6 9 compared to infrared reflection�absorption spectroscopy (IRRAS) obtained from a 500 nm Ag film organic films is possible using infrared reflection� absorption spectroscopy (IRRAS) sampling geometries in the range of a few milli-absorbance units.2 As an alternative to standard IRRAS ...

We examine a method for solving Liouville's equation, consisting of successive application of short time propagators which are evaluated by using fast Fourier transforms. The method is examined numerically by computing electronic absorption spectra. The p...

This review gives a brief description of the theory and application of X-ray absorption spectroscopy, both X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS), especially, pertaining to photosynthesis. The advantages and limitations of the methods ...

The density resolution of a measurement system using laser absorption spectroscopy is evaluated in order to diagnose a fraction of metastable helium atoms (2 3S1) in a neutral helium beam. Experiments performed in a hollow cathode device show that the density resolution of the present system is about 5 � 1013 m-3 for a 1 m absorption ...

The authors studied the primary photochemical processes and the electron donor-acceptor properties of chlorophyll a and carbon tetrachloride by using kinetic absorption and EPR spectroscopy. The induced absorption spectra were studied on lamp and laser pulsed photolysis systems. The EPR spectra were recorded on an E-12 ...

Absorption spectroscopy of individual single-walled carbon nanotubes St�phane Berciaud,a Laurent detected. Here, we used photothermal heterodyne detection to record absorption images and spectra of individual SWNTs. Because this photothermal method relies only on light absorption, it readily ...

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 ...

... Title : ULTRASONIC ABSORPTION SPECTROSCOPY IN FLUIDS BY OPTICAL DETECTION OF PHOTOACOUSTIC PULSE PROFILES. ...

TUNABLE DIODE LASER ABSORPTION SPECTROSCOPY VERIFICATION ANALYSIS FOR USE IN THE COMBUSTION OPTIMIZATION AND ...

... Accession Number : AD0422032. Title : THE USE OF INFRARED ABSORPTION SPECTROSCOPY IN RESEARCH ON HAFNIA AND ZIRCONIA. ...

... Accession Number : AD0606049. Title : ATOMIC ABSORPTION SPECTROSCOPY. Descriptive Note : Final rept. Corporate ...

... Accession Number : ADD752978. Title : AEROSOL ABSORPTION SPECTROSCOPY. Descriptive Note : CONFERENCE PAPER. ...

... Title : A STUDY OF OPTICAL ABSORPTION SPECTROSCOPY FROM METASTABLE EXCITED STATES OF TRANSITION METALS IONS IN ...

The analytical methods available at IPR (MG-Brazil) for the routine determination of uranium are described. These methods are: gravimetric analysis; fluorescence spectroscopy, voltametry, polarography, absorption spectroscopy, beta-and gamma-radiometric a...

This invention relates to a method for the sensitive and selective analysis of an atomic or molecular component of a gas. According to this method, the desired neutral component is ionized by one or more resonance photon absorptions, and the resultant ion...

A method and apparatus that significantly increases the sensitivity and flexibility of laser optoacoustic spectroscopy, with reduced size. With the method, it no longer is necessary to limit the use of laser optoacoustic spectroscopy to species whose absorption must match available laser ...

A method and apparatus for an incipient fire detection system that receives gaseous samples and measures the light absorption spectrum of the mixture of gases evolving from heated combustibles includes a detector for receiving gaseous samples and subjecting the samples to spectroscopy and determining wavelengths of ...

Method 1620 was developed by the Industrial Technology Division (ITD) within the United States Environmental Protection Agency's (USEPA) Office of Water Regulations and Standards (OWRS) to provide improved precision and accuracy of analysis of pollutants ...

... ATOMIC EMISSION SPECTROSCOPY; ATOMIC ABSORPTION ... SPECTROSCOPY; MOLECULAR FLUORESCENCE SPECTROSCOPY; X- ...

... STRUCTURE, SPECTROSCOPY, INFRARED SPECTROSCOPY, ABSORPTION SPECTRA, ULTRAVIOLET SPECTROSCOPY, CHEMICAL ...

... MOLECULAR SPECTROSCOPY, LASER INDUCED FLUORESCENCE, MOLECULAR ... ABSORPTION, ATOMIC SPECTROSCOPY, DISSOCIATION ...

The results of an investigation on the feasibility of determining H/sub 2/S in atmosphere as well as sulfides by an indirect atomic absorption spectroscopy method are reported. The method uses a known amount of buffered Pb(CH/sub 3/COO)/sub 2/ solution added to the test sample and measures the excess reagent using ...

A new method using microemulsified samples is presented. It is for the determination of chromium naphthenate in gasoline by flame absorption spectroscopy. The method has the advantage of simplicity, speed and the use of aqueous standards for calibration instead of organic standards. Coexistent elements do not ...

of spectroscopic methods (photoelectron spectroscopy, inverse photoemission, and X-ray absorption and emission) a comprehensive picture of the electronic (i.e., band...

of spectroscopic methods (photoelectron spectroscopy, inverse photoemission, and X-ray absorption and emission) a comprehensive picture of the electronic (i.e., band...

... cube using the organic absorption features due to chemical bonds in aliphatic hydrocarbons at 1.2, 1.7, ... ...

of spectroscopic methods (photoelectron spectroscopy, inverse photoemission, and X-ray absorption and emission) a comprehensive picture of the electronic (i.e., band...

... molecular V eaa methods, micro�ave absorption apectroscopy, nuclear magnetic resonance,, optical spectroscopy, and masspectroscopy. (C) 0 ...

and Control 16 (1970) 36�51. [13] J. H. Havrda, F. Charvat, Quantification methods of classification processes

A method for determining high concentrations of sodium by Atomic Absorption Spectroscopy (AAS) was developed. Parameter values were set and an interfering ion study completed. This technique utilizing sodium atomic absorption of zinc ion emission from zinc hollow cathode lamp allows analyses of solutions with ...

Method 1620 was developed by the Industrial Technology Division (ITD) within the United States Environmental Protection Agency's (USEPA) Office of Water Regulations and Standards (OWRS) to provide improved precision and accuracy of analysis of pollutants in aqueous and solid matrices. The ITD is responsible for development and promulgation of nationwide standards ...

The overall purpose of the program was to study the emission and absorption characteristics of organic compounds containing nitrogen or phosphorus. The excitation methods included the use of rf plasma and hollow cathode discharge lamps. Results showed tha...

The design aspects of an inelastic neutron spectrometer based on energy selection by the resonance absorption filter difference method are discussed. Detailed calculations of the accessible dynamical range (Q, omega), energy and momentum transfer resoluti...

A method was developed to estimate spectral changes of the absorption properties of turbid media from time-resolved reflectance/transmittance measurements. It was derived directly from the microscopic Beer-Lambert law, and tested against simulations and phantom measurements.

Methods based on atomic-absorption spectrophotometry, and involving various techniques for dissolution and measurement of the sample, have been developed for the determination of trace elements in coal. Non-volatile elements are determined by flame atomic...

Four different techniques for sample preparation were evaluated for determining vanadium and nickel in crude oils by atomic absorption (AA) spectroscopy: (1) The flame-analyzed dilution method which consists of direct-flame AA analysis after diluting the ...

This letter describes the extension of saturated absorption spectroscopy to spatially resolved (point) absorption measurements for diagnostic applications. The technique modifies the standard configuration of Doppler-free saturation spectroscopy by using crossed, rather than counterpropagating, saturating and probe ...