... Accession Number : ADD419473. Title : Photoacoustic Spectroscopy: A Measurement Technique for Low Absorption Coefficients,. ...
DTIC Science & Technology
... Descriptors : (*VAPOR PRESSURE, RESONANCE ABSORPTION), (*COPPER, LINE SPECTRA), ABSORPTION SPECTRA, SPECTROSCOPY ...
Upper atmosphere molecular oxygen concentrations measured by absorption spectroscopy, noting diurnal
NASA Technical Reports Server (NTRS)
... Accession Number : ADA066724. Title : CO Measurements in Combustion Gases by Laser Absorption Spectroscopy and Probe Sampling. ...
... Accession Number : AD0623971. Title : MEASUREMENT OF PLASMA DENSITIES BY VACUUM ULTRAVIOLET ABSORPTION 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.
National Technical Information Service (NTIS)
...Metals in Refuse-Derived Fuel by Atomic Absorption Spectroscopy,1 IBR approved for...Measurement in Natural Gas by Atomic Absorption Spectroscopy, approved December 1...Measurement in Natural Gas by Atomic Absorption ...
Code of Federal Regulations, 2011
... Title : A Broad Band Radiation Source for Optical Absorption Spectroscopy Measurements in Single Shot Transient Media. ...
We propose to provide new measurements of the water-vapor continuum absorption using long-pathlength FTIR spectroscopy, linear laser absorption spectroscopy ...
NASA Website
... PC) spectroscopy can be used to measure the absorption of QDs [2]. In this paper we show that using capacitance [3, 4] and PC spectroscopy it is ...
... DIOXIDE IN THE STRATOSPHERE AND TROPOSPHERE MEASURED BY GROUND-BASED ABSORPTION SPECTROSCOPY, VOL189, NO4202 ...
... ENVIRONMENTAL SAMPLES SIMPLY MEASURED THE NON-SPECIFIC ARSENIC PRESENT USING ATOMIC ABSORPTION SPECTROSCOPY. ...
An investigation was conducted to explore the use of infrared and ultraviolet emission-absorption spectroscopy for determination of temperature profiles in flames. Spectral radiances and absorptances were measured in the 2.7-micron H2O band and the 3064-A...
... Title : Metallic Atoms Concentrations Measurements in an Industrial Low Voltage Circuit Breaker Using Broad Band Absorption Spectroscopy. ...
... Accession Number : ADA068769. Title : Combustion Gas Measurements Using Tunable Laser Absorption Spectroscopy. ...
... ASOPS measurements are made quantitative by making simultaneous measurements using atomic absorption spectroscopy (AAS). ...
... Title : Absolute Concentration Measurements of Free Radicals in Flames by Absorption Spectroscopy. Descriptive Note : Final rept. ...
... Novel Temperature Measurement Approach for a High Pressure Dielectric Barrier Discharge Using Diode Laser Absorption Spectroscopy (Preprint ...
Long path Differential Optical Absorption Spectroscopy (DOAS) using a picosecond UV laser as a light source was developed in our institute. Tropospheric OH radicals are measured by their rotational absorption lines around 308 nm. The spectra are obtained ...
The theory and implementation of quantitative gas phase absorption measurements based on cavity-ringdown spectroscopy with pulsed lasers is discussed. The response of ringdown cavities is modeled using an eigenmode description of the cavity fields, and ex...
... ADP014981 TITLE: A Broad Band Radiation Source for Optical Absorption Spectroscopy Measurements in Single Shot Transient Media ...
... were measured in a flow tube reactor equipped with molecular beam sampling mass spectrometry and ultraviolet absorption spectroscopy, and in a ...
... Then the concentration of trace gasses can be quantified by measuring absorption of the backward-propagating beam as a function of wavelength ...
Photomodulated reflection and optical absorption spectroscopies were used to measure the composition
The measurement approach uses differential absorption spectroscopy of O2 in the 770 nm wavelength region to derive atmospheric pressure. ...
... of Water Vapor Continuum Absorption and Theoretical Feasibility Study of Water Vapor Lineshape by Double Resonance Spectroscopy. ...
Measurement Description: The NCAR Fourier transform spectrometer will record high-resolution solar infrared absorption spectra of the atmosphere above the ...
Diode laser absorption spectroscopy provides a direct method of determinating species concentration and local gas teniperaftue in combustion flames. ...
... Simultaneously, the surface concentration of adsorbed CO was measured using IR reflection absorption spectroscopy. ...
... have devised for measuring the absolute H density involves absorption spectroscopy on the Lyman-alpha transition of ...
... Abstract : Near infrared spectroscopy has recently been used to measure changes of optical parameters (ie, light absorption or scattering) of brain ...
are measured by atomic absorption spectroscopy; and SO4, NO3, Cl, and. PO4 are measured by ion chromatography. All chemical measurements are ...
X-ray absorption spectroscopy is now being applied to the study of a wide range of surface structures. The usefulness of surface EXAFS (SEXAFS) is illustrated by reviewing measurements on the oxidation of aluminum, the absorption of Te and I on silicon an...
never been directly measured. We approach this problem using ultrafast X-ray absorption spectroscopy femtosecond transient absorption spectroscopy and the results are summarized in Figure 1c.11,37,38 Here we of the detector. The spectral data are collected from 7017 to 7624 eV in steps of 4 eV. ...
E-print Network
Intracavity selective absorption spectroscopy has been studied as an analytical technique for measuring ultralow concentrations of airborne iodine radioisotopes. Data are presented which show the sensitivity, linearity, and selectivity of this technique in detecting iodine isotopes.
Energy Citations Database
X-ray absorption spectroscopy is a powerful technique for determination of valency and coordination. Measurements can be made in air or in situ under electrochemical control. The technique will be described and its application to the analysis of passive oxide films, corrosion products, and inhibitors will be reviewed.
DOE Information Bridge
... high resolution IR absorption spectroscopy in ... Descriptors : *HYDROGEN, *ABSORPTION, *SOLID ... PROPERTIES, INFRARED SPECTROSCOPY ...
A functioning optical component absorption measurement facility has been assembled to (1) develop technical competency in evaluating the effectiveness of the technique, and (2) implement the technique as a routine measurement procedure for optical compone...
Calibration and use of the Zeeman Atomic Absorption (ZAA) system to measure Cd are discussed. The results of measurements of NBS Standard Reference Material (SRM) 1571, Orchard Leaves comparing the ZAA and NBS results are tabulated. A second run shows the...
The Brazilian natural pink tourmaline is studied through the polarized optical absorption measurements. The effect of increasing doses of gamma -rays from sup 60 Co in the spectra were determined (maximum of 20MGy). The following optical absorption bands ...
Sulfur dioxide has been measured in a high temperature combustion environment by ultraviolet absorption spectroscopy and by Tunable Atomic Line Molecular Spectroscopy (TALMS). Measurements are made in the post-flame region of a flat flame burner using sto...
Measurements of Formaldehyde by Difference. Frequency Absorption Spectroscopy ( DFGAS). Alan Fried, James Walega, Petter Weibring, & Dirk Richter ...
Ames is working with the vendor to develop an innovative instrument using cavity ring-down absorption spectroscopy (CRDS) to measure the extinction and ...
An optical diagnostic technique for electric field measurement in plasma is presented which is based on observing the Doppler shift in absorption lines due to ion drift.
Aug 2, 2011 ... COBALT makes measurements using off-axis integrated output spectroscopy. Instrument Type: Laser absorption. Measurements: ...
Measurements are reported of absorption coefficient for nitrogen-diluted propane obtained by both photoacoustic spectroscopy and photothermal deflection spectroscopy using a CO/sub 2/ laser.
Direct absorption spectroscopy is used for the measurement of atmospheric OH; autocalibration is achieved by laser induced fluorescence. Measurements by optical absorption present problems concerning the selfproduction of OH, test sensitivity and interact...
) intramolecular proton transfer (ESIPT). A detailed analysis of the transient absorption measurements resolved fluorescence up-conversion and transient absorption spectroscopy. The observation of dual-resolved transient absorption spectroscopy and fluorescence ...
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 ...
NASA Astrophysics Data System (ADS)
The signal-to-noise ratio (SNR) in off-axis integrated cavity output spectroscopy (OA-ICOS) is investigated and compared to direct absorption spectroscopy using multipass absorption cells [tunable diode laser absorption spectroscopy (TDLAS)]. Applying ...
PubMed
The absorption of x rays from a continuous source is studied using the k alpha lines of chlorine ions originally belonging to the laser target. The spectra are solved and integrated to determine the electron temperatures and the absorption lengths in the ...
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 ...
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.
The first direct measurement of the fluorine-atom ground state fine structure transition, using diode laser absorption spectroscopy, is reported. The fine structure absorption line position (spin-orbit energy splitting), measured with high precision relat...
Applications of tunable infrared diode lasers for combustion gas measurements are described. The diode laser serves as a source of narrow-linewidth infrared radiation whose wavelength can be rapidly modulated to perform fast, high-resolution absorption sp...
We demonstrate mid-infrared spectroscopy of large molecules with broad absorption features using a tunable external cavity quantum cascade laser. Absorption spectra for two different Freons are measured over the range 1130-1185 cm(-1) with 0.2 cm(-1) resolution via laser photoacoustic ...
We demonstrate mid-infrared spectroscopy of large molecules with broad absorption features using a tunable external cavity quantum cascade laser. Absorption spectra for two different Freons are measured over the range 1130-1185 cm?1 with 0.2 cm?1 resolution via laser photoacoustic spectroscopy ...
We demonstrate mid-infrared spectroscopy of large molecules with broad absorption features using a tunable external cavity quantum cascade laser. Absorption spectra for two different Freons are measured over the range 1130-1185 cm-1 with 0.2 cm-1 resolution via laser photoacoustic spectroscopy ...
This analysis has presented the basic theory of optoacoustic spectroscopy oriented toward designing a specific system to measure the hydrazine fuels. The fundamental goal in designing this system has been to measure absorption with the greatest possible s...
Intracavity laser spectroscopy (ILS) has been demonstrated to be useful for measuring extremely weak absorption produced by gases in air. ILS is based on the observation that when there are spectrally narrow losses within the cavity of a broadband laser, ...
Described are the results of a four-year study to measure trace pollutant concentrations in polluted atmospheres by kilometer pathlength Fourier transform infrared (FT-IR) absorption spectroscopy. The study covers selected smog episodes during the years 1...
Tunable laser absorption spectroscopy is used in conjunction with an optical fiber probe configuration for the remote measurement of minor chemical species in combustion environments. The sodium atom concentration field in a laboratory combustor was studied in order to characterize probe effects and demonstrate the spatial resolutions ...
... 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 ...
Absorption losses at a nanorough silver back reflector of a solar cell were measured with high accuracy by photothermal deflection spectroscopy. Roughness was characterized by atomic force microscopy. The observed increase of absorption, compared to the smooth silver, was explained by the surface plasmon ...
(9) in their photoacoustic spectroscopy instrument used to measure the optical absorption spectra of solids. They found disagreements of about 2 to I ...
Integrated band intensities of the 620/cm absorption in (C2H2)2 are measured by FTIR spectroscopy at
... Abstract : Low-Mach-number shock waves propagating through a low-pressure ... has also been measured by diode-laser absorption spectroscopy in ...
INTEX-A Data Analysis and DC-8 Measurements of Formaldehyde by Absorption Spectroscopy During INTEX-B and the Winter TC4 Field Campaigns ...
... the matrix was then dissolved in an hcl-hno3 solution and the amount of free magnesium was measured by atomic absorption spectroscopy. ...
... has been measured by vacuum it requires less than a joule of pumping ultraviolet absorption spectroscopy energy to saturate the lasing transition. ...
Abstract: ... were measured by ultraviolet absorption spectroscopy, and rate data were obtained through analysis of induction time and exponential growth ...
... Measured spectra resulted from a superposition of MIR emission from the sample as well as photorefraction and photoinduced absorption of ...
are made at both ends of the absorption cell to check for pressure gradients. Both frequency and pressure/temperature dependent linewidth measurements ...
The dynamics of nonradiative recombination processes are investigated by measuring the thermal expansion and subsequent displacement of a sample surface caused by the absorption of a modulated laser beam. 6 refs., 3 figs.
Remote sensing experiments on numerous satellite and Space Shuttle missions have shown that space-based measurements of infrared absorption or emission can ...
... rates of HCl on aluminum oxide (alumina) particles were measured by a new technique involving real-time ultraviolet absorption spectroscopy in a ...
The PAH hypothesis is consistent with the cosmic abundance ... very recently that two groups were able to measure the absorption spectra of cold PAH ions ...
May 1, 2011 ... Fiber Raman Amplifier Development for Laser Absorption Spectroscopy Measurements ... power narrow linewidth fiber Raman amplifier for the ...
Title: Fiber Raman Amplifier Development for Laser Absorption Spectroscopy Measurements of Atmospheric Oxygen near 1.26 microns. Author: Jeremy Dobler ...
... establishment of absorber sample preparation techniques; measurement of initial calibration spectra using several copper compounds; study of ...
This is done by using a novel diode laser absorption spectroscopy technique to measure the spatial distribution of acetylene, CO, CO2, O2, or other species ...
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 ...
... 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 ...
...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 Spectroscopy (Direct...
... frequencies obtained by Ogoshi et al. (20) using Raman spectroscopies on different metal�porphyrins have been included as input data in a fit of the chl a absorption spectrum measured in diethyl ether (unp...
NBII National Biological Information Infrastructure
We measured the x-ray absorption spectra of gaseous chlorine, Carbon tetrachloride, and Ethylene chloride. The samples were mixed with Helium at approximately 1000 ppm concentration and flowed through the detector/sample cell. This consisted of a cavity i...
We have studied intersubband transitions in InAs/AlSb quantum wells experimentally and theoretically. Experimentally, we performed polarization-resolved infrared absorption spectroscopy to measure intersubband absorption peak frequencies and linewidths as...
Picosecond adsorption spectroscopy requires measurement of changes in the absorption of light in the specimen studied, induced by an exciting light pulse. With very rapid relaxation, the signal recorded depends not only on the amplitude, but also on the t...
The absorption cross section of NO2 has been measured above the 3979 predissociation limit in the region of 3920 and 3950, as well as in the discretely structured areas, around 4112 adn 4140. Spectra were taken in a dual-beam arrangement by means of a tun...
The main purpose of this Study Weekend was to review the contributions that the measurement and interpretation of X-ray absorption spectroscopy, particularly Extended X-ray Absorption Fine Structure (EXAPS), has made, and can make, to the improved underst...
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...
Measurements have been made of the important HDO molecular absorption line parameters near a number of DF laser lines. While the line positions are in good agreement with the values given by the 'AFCRL Atmospheric Absorption Line Parameters Compilation,' ...
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, ...
Laser absorption spectroscopy is an appreciated diagnostic in plasma physics to measure atomic and ionic densities. We used it here more specifically on metallic plasmas. Firstly, a uranium plasma was created in a hollow cathode. 17 levels of U.I and U.II...
Ultrafast ellipsometry and transient absorption spectroscopies are used to measure material dynamics under extreme conditions of temperature, pressure, and volumetric compression induced by shock wave loading with a chirped, spectrally clipped shock drive pulse.
In vivo near infra-red spectroscopy (NIRS) is based on interrogation of tissue with light a non invasive measurement. Penetration with near infra-red wavelengths in tissues is greater than with visible light and specific absorption by compounds relevant f...
A tunable diode laser infrared spectrometer has been constructed which uses the general techniques of infrared reflection and absorption spectroscopy to measure in situ molecular vibrational spectra of liquids and their interactions with metal oxide surfa...
... sensors, imaging spectroscopy produces quantitative estimates of biophysical absorptions, which can be used to improve scientific understanding ... features. Narrow spectral bands can measure many individ...
In derivative spectroscopy, the authors optimize the measurement sensitivity by using the maximum excursion of the derivative of the spectral absorption coefficient as a single spectral line is scanned. Results for lines with pure Doppler or Lorentz conto...
Difluorocarbene (CF2) has been observed by time-resolved diode laser absorption spectroscopy following excimer-laser photolysis of C2F4. A band strength of 2.8 X 10-17 cm molecule-1 for the v3 band may be inferred from the absorption measurements, assumin...
We describe the sensitive detection of ammonia by wavelength modulated cavity enhanced infrared tunable diode laser absorption spectroscopy at 1994 nm. The spectrometer can measure a fractional absorption of �10-5 for an absorption pathlength of a few kilometers. The spectral resolution 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 oil-gas source ...
by measuring the time evolution of the resulting photoinduced absorption. This way, the studies of carrier and recombination dynamics, determined by measuring photoinduced changes in optical properties (reflectivity in these experiments ranges from THz [6, 7, 8] (enabling direct measurement of photoinduced ...
Measuring method using Cerenkov light emitted during the electron pulse is developed in the purpose of intermediate kinetics studies. The measuring set was applied for measurements of light emitted from the vessel. The study of kinetics of Cerenkov light ...
Two Sidewinder--A.V. Arcas rockets were instrumented to measure the ozone distribution during the initial and final phases of a solar proton event. The measurements were obtained by the technique of solar absorption spectroscopy and covered the altitude r...
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...
Precise relative measurements of sky continuum and line emission and absorption have been made using FTIR spectroscopy. During conditions of horizontally uniform air composition, measurements of the variation of the spectral radiance with elevation angle ...
We experimentally demonstrate a 300?m long silicon photonic crystal slot waveguide for on-chip near-infrared absorption spectroscopy. Based on the Beer-Lambert absorption law, our device combines slow light in photonic crystal waveguide with high electric field intensity in low-index 75nm wide slot, which effectively increases the ...
Ultraviolet absorption spectroscopy has been used to measure the photodissociative absorption band of As[sub 4] in the spectral range from 190 to 370 nm. The As[sub 4] absorption bands are assigned to [sup 1][ital A][sub 1][r arrow][sup 1][ital T][sub 1][sup [ital A],[ital B
Six hundred and thirty references are cited in this review. The information in the review is divided into 12 major areas: books, reviews, and bibliographies; fundamental studies in flames; developments in instrumentation; measurement techniques and procedure; flame emission spectrometry; flame atomic absorption spectrometry; flame molecular ...
be monitored by measuring the transient absorption spectrum though a probe laser pulse that is variably delayedFemtosecond transient absorption dynamics of close-packed gold nanocrystal monolayer arrays q Sang Femtosecond transient absorption spectroscopy is used to investigate hot electron ...
We demonstrate measurements of OH absorption spectra in the post-flame zone of a McKenna burner using spatial heterodyne spectroscopy (SHS). SHS permits high-resolution, high-throughput measurements. In this case the spectra span approximately 308-310 nm with a resolution of 0.03 nm, even though an extended source ...
Quantum spectroscopy was performed using the frequency-entangled broadband photon pairs generated by spontaneous parametric down-conversion. An absorptive sample was placed in front of the idler photon detector, and the frequency of signal photons was resolved by a diffraction grating. The absorption spectrum of the sample was ...
A new technique, vacuum-ultraviolet laser absorption spectroscopy, has been developed to quantitatively determine the absolute density of H and H sub 2 within a plasma. The technique is particularly well suited to measurement in a plasma, where high charg...
Measurement of Atmospheric Bromine Monoxide Using Differential Optical Absorption Spectroscopy over in the Arctic can be properly determined and interpreted relative to bromine induced ozone loss during arctic spring, the ozone concentrations were anti-correlated with bromine levels in the atmosphere. Bromine
The paper describes a technique for measuring the average energy: and its temporal changes: of intense electron beams on time scales down to a few nanoseconds using 3-channel absorption spectroscopy of the bremsstrahlung from a thin target. The technique appears useful for reasonably monoenergetic electron beams in the energy range ...
In order to investigate the post-arc period and the hot gas regions surrounding the electrical arc in circuit breakers, a broad band radiation source has been developed to perform absorption spectroscopy measurements. The radiation spectrum has been chara...
