... Descriptors : (*VAPOR PRESSURE, RESONANCE ABSORPTION), (*COPPER, LINE SPECTRA), ABSORPTION SPECTRA, SPECTROSCOPY ...

... Accession Number : ADA132786. Title : Elimination of Line-Shape Distortion in Laser Absorption Spectroscopy in Atomic Beams,. ...

Nov 1, 1977 ... Subject Terms: ABSORPTION SPECTRA; EMISSION SPECTRA; GASES; INFRARED SPECTROSCOPY; LINE SPECTRA; REMOTE SENSORS; SPECTRUM ANALYSIS; ...

Precision laser spectroscopy of atomic hydrogen and deuterium will be reviewed. The Balmer-alpha line has been studied by Doppler-free saturated absorption spectroscopy, polarization spectroscopy, optical-radiofrequency double quantum spectroscopy, and by...

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,' ...

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 ...

A multiline absorption spectroscopy technique was investigated based on the single-line absorption spectroscopy technique. An open-path methane-detecting system was designed. An LED was used as a broadband source, and a Fabry-Perot interferometer whose transmission peaks matched the methane ...

... been examined using absorption and fluorescence spectroscopy. ... The fluorescence of Cs2 was observed for ... normalized to the atomic line emission ...

... ATOMIC SPECTROSCOPY, COPPER, INTENSITY, ABSORPTION SPECTRA, HARTREE FOCK APPROXIMATION, VISIBLE SPECTRA ...

An x-ray absorption spectrometric technique is described. A preliminary experiment to observe emission lines from a wide range of targets was attempted. (DLC)

An x-ray absorption spectrometric technique is described. A preliminary experiment to observe emission lines from a wide range of targets was attempted. (ERA citation 11:016775)

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...

We discovered Balmer-lines absorption from Halpha to H9 in iron low-ionizaton broad absorption line (FeLoBAL) quasar, SDSS J172341.10+555340.5 by near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camera for OHS (CISCO) attached to the Subaru telescope. The redshift of the ...

Using far infrared absorption spectroscopy, the authors have investigated electronic transition spectra of Se donors in AlSb as a function of hydrostatic pressure. At least two distinct ground to bound excited state transition lines, which depend quadrati...

(QIALs) and spatially intervening absorp- tion lines (SIALs). QIALs are thought to be produced by gas absorbers, which produce lines with b = 10,000�20,000 km s�1, are thought to be at a distance of a few tensSUBARU HIGH-RESOLUTION SPECTROSCOPY OF COMPLEX METAL ABSORPTION LINES OF THE ...

A PETOS-Basic program was written which provides the off-line treatment of data in optical emission spectroscopy, flame photometry and atomic absorption spectroscopy. Polynomial calibration functions are fitted in overlapped steps by the least squares met...

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 ...

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 ...

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 ...

A brief review of recent developments in line shape studies using laser spectroscopy is presented. Experiments are discussed in which the absorption or emission line profiles associated with various transitions in a vapor can be used to provide useful inf...

Fourier transform infrared (FTIR) spectroscopy can capture the wide dynamic spectral range of H2O and HDO lines and their absorption depths throughout the ...

This project uses a ringdown cavity to provide the ultra-long effective path length needed for spectroscopy with weak infrared absorption lines, ...

Jan 1, 1974 ... Subject Terms: ABSORPTION SPECTRA; ASTRONOMICAL MODELS; ASTRONOMICAL SPECTROSCOPY; ATMOSPHERIC MODELS; ATOMIC SPECTRA; BALMER SERIES; ...

Observations of IRC +10216 are discussed, where a few absorption lines of silane (SiH4) have been observed.

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.

... where I have developed a course entitled "Archaeoastronomy and World Cosmology." My research area is actually in quasar absorption line spectroscopy, ...

... spectroscopy techniques used to characterize these materials included four-wave mixing, two photon absorption and fluorescence line narrowing. ...

... where I have developed a course entitled "Archaeoastronomy and World Cosmology." My research area is actually in quasar absorption line spectroscopy, ...

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

Mar 1, 2011 ... High-resolution (1-A) spectroscopy of the broad-absorption-line QSO, which fails to confirm the Ca II H and K absorption features reported ...

Attenuation of infrared radiation in the troposphere is dominated by water vapor absorption. Most past work on the spectroscopy of water vapor has been on the analysis of the rotational and vibrational bands. As a result a thorough listing of line positio...

This final report gives the results of an investigation on paramagnetic defect centers produced in x-, y-, and neutron irradiated single-crystal calcite. Electron spin resonance absorption spectroscopy was used to make a quantitative study of a number of ...

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...

We demonstrate a simple method that can be used to detect minor isotope lines in a saturated absorption spectrum by the absorption filtering of major isotope lines. We investigate this method for use in the spectroscopy of the 1S0-1P1 transition in Yb at 399 nm by controlling the density of Yb ...

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...

Abstracts of one hundred papers given at the conference are presented along with the conference program and an author index. Session topics include: highly ionized atoms; laser spectroscopy and hyperfine structure; complex spectra; laser spectroscopy, radiation theory; theory of highly ionized atoms and analysis of plasmas; plasma ...

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 achievable. The ...

Using optothermal spectroscopy an investigation is performed of the absorption of the FIR laser molecule acetonitrile (CH3CN) at 63 lines of a tunable waveguide CO2 laser. The results are presented in the form of an atlas which can be used as a reference for further spectroscopic investigations.

, as well as local ore smelters. Using laboratory-based Atomic Absorption Spectroscopy (AAS) and portable X J/cm2 Comparing Pb concentrations determined by Atomic Absorption Spectroscopy (AAS), X is shown below, along with the Pb emission line at 405.78 nm which was the largest emission ...

This paper briefly discusses progress on the beam lines at the National Synchrotron Light Source. Experiments on amorphous materials are also discussed. (LSP)

The authors present a third-order perturbation calculation of line shapes in laser spectroscopy based on the density-matrix formalism. The new feature of this theory is the inclusion of the Gaussian spatial structure of the laser beams. They study the lin...

This publication describes the development and initial testing of instrumentation for continuous on-line analytical measurement of mercury concentrations in complex gas streams or in ambient air, in the presence of smoke, organic vapors, and oil mist from...

The sounding of IR absorption lines with high optical thickness of IR-active trace gases in the stratosphere was investigated. The significance of the sensitivity of the radiance, integrated over a line, on changes in the absorber mass, is discussed. The ...

In this paper we present a new method for determining the self-absorption coefficients of emission lines in laser-induced breakdown spectroscopy (LIBS) experiments. With respect to other methods already present in the literature, the proposed approach has the advantage of not requiring, providing some conditions are fulfilled, any ...

Interference caused by direct spectral overlap can be corrected by Zeeman Atomic Absorption Spectroscopy. Typical cases of interference of this kind appearing in the analysis of Sb were examined. Sb lines at 217.023 nm and 231.147 nm overlap the Pb absorption line at 216.999 nm and the Ni ...

... 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 ...

NGC2110Spectroscopy Dan Evans (Harvard), Julia Lee (Harvard), Jane Turner (UMBC/GSFC), Kim Weaver (GSFC), Herman Marshall (MIT) #12;NGC2110Spectroscopy � The Fe K line complex in general consists. 2005) Diskline? Compton shoulder? Complex absorption? #12;NGC2110Spectroscopy Nearby (z=0.0076, ...

We demonstrate that terahertz microstrip-line waveguides can be used to measure absorption spectra of polycrystalline materials with a high frequency resolution (~2 GHz) and with a spatial resolution that is determined by the microstrip-line dimensions, rather than the free-space wavelength. The evanescent terahertz-bandwidth electric ...

Solid-state organic compounds such as ?-lactose-monohydrate and biotin have been shown to have narrow and intense THz absorption features at room temperature. Interest in lineshapes in the THz region is justified not only for practical reasons, since they are of crucial importance to spectroscopy-based identification of materials, but also because of the ...

... 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 ...

Seventy-eight absorption lines, located in an extremely crowded portion of the CH3OH spectrum, have been measured with a tunable coherent FIR spectrometer, based on third order mixing in a point contact diode. The high experimental resolution (20 kHz) allows the separation of overlapping lines observed with a Fourier transform ...

We measured the absorption spectrum of water vapor in 0.2-2.4THz range at different humidity from 17% to 98% at room temperature using Er: doped fiber laser (IMRA America Inc.) based terahertz time-domain spectroscopy. The experiments were performed in a nitrogen-purged cage at atmosphere environment to obtain the reference and water ...

Optical spectroscopy is used to study the laser ablation process of ZnO targets. It is demonstrated that even if Partial Local Thermal Equilibrium is present, self absorption process leads to a decrease of recorded lines emission intensities and have to be taken into account to obtain correct values of such parameters. It is presented ...

A new electronic transition of PtS with a red degraded band head at 12 460 cm-1 was recorded and analyzed. Gas phase PtS was produced in a platinum-lined hollow cathode with a trace of SF6 gas, and the spectrum was recorded at near Doppler resolution using intracavity laser absorption spectroscopy. Molecular constants for the newly ...

Several new bands of PtF has been recorded in the near-infrared with rotational resolution using intracavity laser absorption spectroscopy. The results of the analysis will be presented. The gas phase PtF molecules were produced using a platinum-lined hollow cathode in an argon-based electric discharge with a small amount of SF6.

Self-absorption is used in laser induced breakdown spectroscopy to obtain quantitative analytical information. In this approach two plasmas are generated with a laser pulse that is split into two beams separated by a few millimeters and incident on the target material. One of the beams generates plasma that acts as the light source analogous to that used ...

The differential atomic absorption spectroscopy method is widely used both in scientific investigations and analytical applications. Absorption coefficient (absorption cross section) is an individual characteristics of every element therefore it provides for a high selectivity of an analysis. Differential ...

With the passage of the Clean Air Act Amendments of 1990, the on-line monitoring of mercury in effluents from coal combustors and gasifiers is receiving considerable interest. In this study, the applicability of using atomic fluorescence and atomic absorption techniques for on-line monitoring applications is discussed. Laboratory data ...

The average absorption coefficients, at intervals of 10/cm in the region 20 - 110/cm, are determined for germanium samples with gallium concentration varying from 0.98 x 10 to the 15th power/cu cm to 9.26 x 10 to the 15th power/cu cm. The functional dependence of the absorption coefficients on concentration and frequency is discussed and interpretation of ...

We present the discovery of Balmer-line absorption from H? to H9 in an iron low-ionizaton broad absorption line (FeLoBAL) quasar, SDSS J172341.10+555340.5, by near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camera for OHS (CISCO) attached to the Subaru Telescope. The ...

The issues related to high-precision measurement of the absorption line profiles of water vapour and its isotopomers using the methods of diode laser spectroscopy in the near IR range aimed at the analysis and detection of greenhouse gases are considered. The absorption line shape of H216O is ...

the light waves involved in the FWM process. Based on the results of these plasma-transmission mea distributions of plasma atoms line by line. In this scheme, a pair of cylindrically focused coplanar broad light in the plasma line by line. Absorption measurements Light beams propagating in ...

A small sampling probe with a compact in-line absorption cell has been combined with tunable diode laser absorption spectroscopy for measuring mole fractions of IR-active species in combustion gases with temporal and spatial resolution. The system characteristics are described, and initial results are reported for ...

Optoacoustic techniques are used to systematically investigate the absorption of CH3OH (methanol) around each of the normal CO2 laser lines. A cylindrical single-pass sealed cell was used, and signal detection was by means of an electret microphone inside the cell. A graphic atlas of the 158 absorptions obtained is presented. These ...

The absorption line shape of Cs-Ar system is recorded using two-photon ionization of the system with Cs(7P) as an intermediate state. New satellite structures in the wings of Cs(7P) are observed which were not resolved in previous absorption measurements. Also the absolute absorption cross section in the blue wing ...

Far infrared vibrational Spectroscopy for distilled water was performed by Fourier Transform Infrared Spectroscopy (FT-IR) in the FTIR beam line of MIRRORCLE 20. Synchrotron radiation was utilized as a light source for the absorption Spectroscopy in the frequency range from 100cm-1 to 20cm-1. ...

The P(9) fundamental infrared absorption line of carbon monoxide at 2107.4/cm has been studied with high resolution using a cw current tunable PbS(0.82)Se(0.18) diode laser. Both the Doppler linewidth of 150 MHz and the absorption coefficient at line cent...

TALM spectroscopy consists of splitting a source atomic emission spectral line by means of a magnetic field (Zeeman effect) and making a differential absorption measurement between one Zeeman component that has been magnetically tuned to match an analytic...

We report on the development of a new sensor for NO? with ultrahigh sensitivity of detection. This has been accomplished by combining off-axis integrated cavity output spectroscopy (OA-ICOS) (which can provide large path lengths of the order of several kilometers in a small volume cell) with multiple-line integrated absorption ...

The present invention is directed to a method for determining the utilization factor [U] in a photochemical mercury enrichment process (.sup.196 Hg) by measuring relative .sup.196 Hg densities using absorption spectroscopy.

This program was undertaken to investigate the application of a new high resolution ultraviolet-visible absorption technique called tunable atomic line molecular spectroscopy (TALMS) to the detection of a variety of volatile organic molecules of concern to the Environmental Prote...

emission and Ca ii H and K absorption, are expected for z > 1 galaxies. In the LRIS blue side, we used the 300 lines mm1 grating blazed at 5000 A? . ...

A tunable diode laser is used to investigate the nu sub 8 vibrational band of Sulfuryl Fluoride in the 11 micrometer region. Although the absorption spectrum is doppler limited, the resolution is high enough to observe previously unresolved lines and ther...

The Gallium Arsenide Laser Line-Locked Absorption Sensor (GALLS) research program involves the development of a new technique for the detection and quantification of molecular species. GALLS uses a laser-diode which is actively locked to a molecular absor...

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 ...

... Carter, and T. Mathur, "Near-infrared diode laser ... spectroscopic parameters in the near-IR (6940-7440 cm ... line-of-sight absorption spectroscopy," 4 4 ...

Contents: IR absorption spectra of diaryl substituted 1,4-divinylbenzenes; and A theoretical and experimental investigation of the absolute intensities and depolarizations of lines in the raman spectra of polyatomic molecules.

Methyl cyanide or acetonitrile, CH3CN, is an important trace species in atmospheric pollution (it is produced in biomass burning and other combustion processes) and astrochemistry (e.g. in the atmosphere of Titan). In order to explore the potential of CH3CN detection using absorption spectroscopy in the near infrared, we have measured its spectrum in the ...

A sensor based on tunable diode laser absorption spectroscopy was constructed for time-resolved temperature and water vapor concentration measurements in a scramjet combustor. The sensor probed two absorption lines near 1390 nm with two time-multiplexed lasers used to measure temperature and water vapor ...

A heterodyne spectrometer for the 10 micron wavelength range was used for the investigation of absorption lines in planetary and stellar atmospheres with very high resolution. The atmosphere of Mars and the circumstellar envelopes of bright IR stars were investigated using IR telescopes. The Mars observations provide the isotope ratios C-12/C-13 and ...

In this work we present measurement and results of the deconvolution of the Hg 253.7 nm spectral line shapes, emitted from the mercury isotope high-frequency electrodeless discharge lamps, made at the Institute of Atomic Physics and Spectroscopy for the use in Zeeman Atomic Absorption Spectrometry. The emission ...

Laser induced fluorescence (LIF) was utilized for the determination of the densities of Ti atoms and ions (Ti+) in a dc magnetron discharge. The densities were measured under different discharge conditions, namely the discharge current, working pressure and distance from the magnetron target. The total density of species in the discharge was calculated using additional measurements of the ...

We show that a cold, dense laboratory plasma can be readily characterized by extreme ultraviolet absorption spectroscopy. The plasma is produced by irradiating a thin aluminum foil with a pulsed soft x-ray source. The same source also provides a backlighting continuum for absorption spectroscopy. Time-integrated ...

Quasar absorption lines in flat universes with nonzero cosmological constant Lambda are examined and

... Accession Number : AD0619963. Title : INVESTIGATION OF NARROW LINE ABSORPTIONS IN SINGLE CRYSTAL CALCITE. ...

... Title : ABSORPTION LINE SERIES AND AUTOIONIZATION RESONANCE STRUCTURE ANALYSIS IN THE ULTRAVIOLET SPECTRUM OF SR I,. ...

The basic theoretical considerations involved in developing instruments for electron spectroscopy for atoms and solids are discussed. To be competitive with x-ray emission or absorption spectroscopy methods, electron spectroscopy would have to achieve such high resolution that well-defined electron ...

On-line discrimination between arbitrary petroleum products is necessary for optimal control of petroleum refinery and pipeline operation and process control involving petroleum distillates. There are a number of techniques by which petroleum products can be distinguished from one another. Among these, optical measurements offer fast, non-intrusive, real-time characterization. ...

The spectrum of CS+ cation was recorded in the 12,235-12,600 cm?1 region by employing optical heterodyne velocity modulation absorption spectroscopy. In combination with simultaneous measurement of optical heterodyne concentration modulation absorption spectroscopy, the spectral lines of CS+ ...