4 edition of Thermochemistry of materials by laser vaporization mass spectrometry found in the catalog.
Thermochemistry of materials by laser vaporization mass spectrometry
by U.S. Dept. of Commerce, National Bureau of Standards, Order from National Technical Information Service in [Washington, D.C.], [Springfield, VA
Written in English
|Statement||John W. Hastie, David W. Bonnell and Peter K. Schenck|
|Series||NBSIR -- 87-3561, NBSIR -- 3561|
|Contributions||Schenck, Peter K, Bonnell, David W, United States. National Bureau of Standards|
|The Physical Object|
High‐temperature Knudsen effusion mass spectrometry was used to study the vaporization processes and to determine the thermodynamic properties of the components in the Bi 2 O 3 ‐P 2 O 5 ‐SiO 2 system. Measurements were performed with a MS‐ magnetic sector mass spectrometer. Transpiration mass spectrometry, mass spectrometric analysis of the vaporization of mass spectrometry, Proceedings of the 10th Materials Research Symposium, NBS SP, , p. Google Scholar. 8. Hastie, J. W., High Temperature Vapors: Science and Technology, Academic Press, New York ().
Mass spectrometry, also called mass spectroscopy, analytic technique by which chemical substances are identified by the sorting of gaseous ions in electric and magnetic fields according to their mass-to-charge instruments used in such studies are called mass spectrometers and mass spectrographs, and they operate on the principle that moving ions may be deflected by electric and. Bisphenol A diglycidyl methacrylate (Bis-GMA) was adsorbed onto or covalently bound to a porous silicon oxide surface. Laser desorption eV postionization mass spectrometry (LDPI-MS) was previously demonstrated for surface analysis of adsorbed and surface bound Bis-GMA, but signal to noise levels were low and ion fragmentation was extensive. eV postionization using the fluorine laser.
Mass Spectrometric Study of the Vaporization of Oxide Systems, J. H. Beynon FRS (Ed.), John Wiley, New York () V. L. Stolyarova and G. A. Semenov Metallurgical Thermochemistry. Pergamon Press, High-temperature Mass Spectrometry in Materials research. Rapid Commun. Mass . Laser-pulse-vaporization of refractory materials Donald R. Olander measurement and calculation methods are outlined and the use of mass spectrometry to analyze the vapor is reviewed. - the thermochemistry of the material, by which the equilibrium pressures in Eq(2).
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A very high pressure sampling mass spectrometer has been used to study the thermochemistry and kinetics of laser induced plumes from graphite and YBa 2 Cu 3 O x targets. Time resolved mass spectra of C n (n=1–9) neutral vapor species were obtained from graphite targets under conditions of varying laser–surface interaction geometry and vapor plume‐sampling by: Get this from a library.
Thermochemistry of materials by laser vaporization mass spectrometry: final report. [John W Hastie; Peter K Schenck; David W Bonnell; United States. National Bureau of Standards.]. An earlier laser-based mass spectrometric approach substantially overcame these limitations, but with reduced precision in temperature and pressure determination.
Here, we present new methods that largely resolve the earlier limitations of laser-assisted vaporization mass spectrometry, thereby greatly expanding the scope of application of high Author: John W. Hastie, D W. Bonnell, Peter K. Schenck.
Get this from a library. Laser-assisted vaporization mass spectrometry: application to thermochemistry at very high temperatures. [John W Hastie; D W Bonnell; P K Schenck; National Institute of Standards and Technology (U.S.)]. Of the different methods, the laser pulse-heating technique is advantageous.
We have developed a laser-induced vaporization–mass-spectrometry system and studied the vaporization behavior of nuclear fuel materials such as UO 2, UC, and ThO 2, and other technologically important materials such as graphite and Si 3 N 4 at very high : M.
Joseph, N. Sivakumar, P. Manoravi. temperatures. Previously, we have shown that pulsed laser heating, coupled with time-dependent mass spectrometry of the free-expansion vapor plume, can be used for semi-quan-titative measurements of vaporization thermochemistry.
The present work extends this. Laser electrospray mass spectrometry (LEMS) is demonstrated for pharmaceutical samples at atmospheric pressure. A nonresonant, femtosecond duration laser pulse vaporizes native samples at atmospheric pressure into an electrospray plume for ionization with subsequent transfer into a time-of-flight mass spectrometer.
The active ingredients in pharmaceutical tablets were detected in the. SELENIUM Bruce E. Knox Materials Research Laboratory The Pennsylvania State University University Park, Pa.
(Received Febru ; Communicated by R. Roy) ABSTRACT The laser - mass spectrometer has been used to study the vaporization of the hexagonal and a-monoclinic forms of crystalline selenium as well as glassy and vapor-grown thin. The vaporization of DyBr 3 (s) was investigated in the temperature range between and K by Knudsen effusion mass spectrometry.
The ions Dy +, DyBr +, DyBr + 2, DyBr + 3, Dy 2 Br + 5, and Br + were detected and their appearance potentials determined leading to an upper bound for the atomization energy of DyBr 3 (g). Amphiphilic lipids and hydrophobic proteins are vaporized at atmospheric pressure using nonresonant 70 femtosecond (fs) laser pulses followed by electrospray post-ionization prior to being transferred into a time-of-flight mass spectrometer for mass analysis.
Measurements of molecules on metal and transparent dielectric surfaces indicate that vaporization occurs through a nonthermal mechanism. A combination of KEMS and laser vaporization mass spectrometry (LVMS) data show congruent vaporization, for molten alumina up to ∼ K (Hastie et al.
The problem of correlation between the temperature of the target surface and the mass-spectrometer signal in laser-vaporization mass spectrometry has been analyzed theoretically. An assessment of the high temperature mass spectrometric technique is given, with emphasis on sources of inaccuracy, particularly ionization cross sections Laser-Assisted Vaporization Mass Spectrometry: Application to Thermochemistry at Very High Temperature.
The laser vaporization cluster source has been used for the production of gas phase atomic clusters and metal-molecular complexes for 30 years. Numerous experiments in the chemistry and physics of clusters have employed this source.
Its operation is simple in principle, but there are many subtle design features that influence the number and size of clusters produced, as well as their. The laser vaporization process was demonstrated to be a suitable technique for introducing solutions into the inductively coupled plasma (ICP), similar to the introduction of solids using a laser ablation process.
The technique was found to have several advantages over the conventional nebulization method of. The performance of solution nebulization (SN), electrothermal vaporization (ETV) and laser ablation (LA) of dried micro-droplets as sample introduction systems for ICP-MS are compared for the determination of several radionuclides in digested biological tissue, nearshore sea-water and river s were subjected to a Ca 3 (PO 4) 2 co-precipitation preconcentration prior to analysis.
John W Hastie has written: 'Thermochemistry of materials by laser vaporization mass spectrometry' -- subject(s): Thermochemistry, Effect of temperature on, Graphite 'Laser-assisted vaporization.
Data System Mass Detector Analyzer Vacuum System Source Inlet Region *More precisely mass spectrometry determines the mass of a molecule. **The mass to charge ratio (m/z) is used to describe ions observed in mass convention, m is the numerical value for the mass of the ion and z is the numerical value for the charge of the ion.
materials sciences. In this work the heat transfer and phase change phenomena during nanosecond laser ablation of a copper (Cu) target in a helium (He) background gas at atmospheric pressure are presented.
An enthalpy model is outlined, which accounts for heating, melting, and vaporization of. Laser ablation or photoablation is the process of removing material from a solid (or occasionally liquid) surface by irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or high laser flux, the material is typically converted to a y, laser ablation refers to removing material with a pulsed laser, but.
Inductively coupled plasma mass spectrometry (ICP-MS) is a type of mass spectrometry that uses an Inductively coupled plasma to ionize the sample. It atomizes the sample and creates atomic and small polyatomic ions, which are then is known and used for its ability to detect metals and several non-metals in liquid samples at very low concentrations.In organic mass spectrometry provides established analytical techniques to analyze know and unknown materials in respect to their elemental composition or species, to quantify the elemental concentration of major, minor and trace elements in any samples for the determination of the exact mass of isotopes and precise and accurate isotopic abundances or isotope ratios.
Beginning with a.References >> Mass Spectrometry. Mass Spectrometry. Mass spectrometry is a powerful analytical technique used to quantify known materials, to identify unknown compounds within a sample, and to elucidate the structure and chemical properties of different molecules.