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Friday, November 13, 2020 | History

3 edition of A molecular beam mass spectrometric study of the formation and photolysis of CIO dimer found in the catalog.

A molecular beam mass spectrometric study of the formation and photolysis of CIO dimer

A molecular beam mass spectrometric study of the formation and photolysis of CIO dimer

final report

by

  • 64 Want to read
  • 17 Currently reading

Published by Midwest Research Institute, National Aeronautics and Space Administration, National Technical Information Service, distributor in Kansas City, MO, [Washington, DC, Springfield, Va.? .
Written in English

    Subjects:
  • Molecular spectra.,
  • Molecular beams.

  • Edition Notes

    Statementby Frank T. Greene, David A. Robaugh.
    SeriesMRI report, NASA-CR -- 190259., NASA contractor report -- NASA CR-190259.
    ContributionsRobaugh, David A., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15364003M

      Anal. Chem. All Publications/Website. OR SEARCH CITATIONS. Molecular Beam Mass Spectrometry for Studying the Fundamental Chemistry of Flames. Authors Biordi-JC Source Prog Energy and Combust Sci 3(3) Link NIOSHTIC No.


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A molecular beam mass spectrometric study of the formation and photolysis of CIO dimer Download PDF EPUB FB2

Get this from a library. A molecular beam mass spectrometric study of the formation and photolysis of CIO dimer: final report. [Frank T Greene; David A Robaugh; United States. National Aeronautics and Space Administration.]. The photoionization efficiency (PIE) spectra for M(CO)n+ (n=0–6) from M(CO)6, M=Cr, Mo, and W, have been measured in the photon energy range of – Å.

Based on the ionization energies for M(CO Cited by:   Molecular beam mass spectrometry (MBMS) is capable of measuring radicals, ions and molecules simultaneously, which has been applied to the species diagnostics in systems of combustion, and plasma.

In this work, a novel dielectric barrier discharge (DBD) facility coupled with the MBMS technique is by: 6. Magrini, K., et al. “Using Pyrolysis Molecular Beam Mass Spectrometry to Characterize Soil Carbon in Native Prairie Soils.” Soil Sci.

(); pp. Sykes, R., et al. “High-Throughput Screening of Plant Cell-Wall Composition Using Pyrolysis Molecular Beam Mass Spectroscopy.” Biofuels: Methods and Protocols. Chapter 20 - Molecular Mass Spectrometry MS is probably the most widely applicable of all the analytical tools available.

Read pp. Problems: none 1. Elemental composition of samples of matter. Structures of inorganic, organic and biological molecules. Qualitative and quantitative composition of complex samples. The formation of a molecular beam in sampling 1 torr to 1 atm.

gases (Ar or H 2) is studied for three diameters ρ of the sampling orifice. To modulate the beam, use is made of a mechanical chopper placed very near the sampling orifice.

This enables us to measure the scattering of the beam by collisions between beam molecules. The system at CPC lab presently is connected to an Electron Impact Ionisation–Molecular Beam Mass Spectrometry (EI-MBMS) sampling system for identification and quantification of reactants, intermediates, and products.

The sampling of the reactor contents is done by a quartz nozzle and a skimmer, which allows for the formation of a molecular beam. A study was performed of the chemical and thermal structure of flames of model composite propellants based on cyclic nitramines (RDX and HMX) and an active binder (glycidyl azide polymer) at a pressure of 1 MPa.

Propellant burning rates were measured. The chemical structure of the flame was studied using molecular-beam mass spectrometry, which previously has not been employed at high pressures.

In this study a discharge-flow reactor coupled with molecular beam mass spectrometry has been used to study the BrO + HO_2 reaction over the temperature range K.

Rate constants were. Molecular-Beam Mass-Spectrometric Analyses of Hydrocarbon Flames Saugata Gon University of Massachusetts Amherst Follow this and additional works at: This thesis is brought to you for free and open access by [email protected] Amherst.

It has been accepted for inclusion in Masters Theses. The temporal evolution of the neutral plasma chemistry products in a capacitively coupled plasma from argon/helium/acetylene is followed via molecular beam mass spectrometry with a time resolution of ms. Several chemistry pathways are resolved. (i) The formation of C2nH2 (n = 2−5) molecules proceeds via the following sequence: the production of highly reactive C2H radicals in.

A schematic diagram of the apparatus is shown in Fig. A molecular beam of caesium atoms was produced by heating caesium to °K in an oven O, in one side of which was a horizontal slit of width channel A and the foreslit F served to define the beam, and the slit C, which was equidistant from the foreslit and detector D, acted as a collimator.

Electron resonance capture mass spectra of the radical anions of 1,2-C 2 B 10 H 12 and 1,2-C 2 B 10 H Me in the gas phase confirm the existence of long-lived negative ions in these carbaboranes. An estimation of charge distributions in 1,2- and 1,7-C 2 B 10 H 12 have been derived from a photoionization mass spectrometric study of.

Here, we present an explorative approach to study volatile species gas phase kinetics in a novel coal-plate experiment probed with molecular-beam mass spectrometry. This coupling allows for time-resolved quantitative measurements of the gas-phase directly above the surface of solid fuels, which aid gaining more insight into the gas phase.

The nascent photofragments are formed by UV photolysis, they are subsequently photoionized by time-correlated XUV laser radiation and finally detected by time-of-flight mass spectrometry.

Primary. A molecular beam mass spectrometry system for in situ measurement of the concentration of gas phase species including radicals impinging on a substrate during thermal plasma chemical vapor deposition (TPCVD) has been designed and constructed.

Dynamically controlled substrate temperature was achieved using a variable thermal contact resistance method via a backside flow of an. Molecular Beam Mass Spectrometry.

Evaluating catalytic performance in real-time under harsh operating conditions through continuous product sampling and analysis Overview: Molecular beam mass spectrometer (MBMS) systems developed at the National Renewable Energy Laboratory (NREL) provide analysis of harsh environments that are problematic for.

Buck's research works with 9, citations and 4, reads, including: The end of ice I. Figure tic diagram of YbF molecular beam experiment. The fluorescence signal, shown in the upper left, measured by the probe photomultiplier tube (PMT) represents the time-of-flight of molecules after the Q-switched ablation-laser bottom graph shows the phase of the superposition of the m F = −1 and m F = 1 levels as a function of B, which is probed by the population of the.

study prompt thermochemical phenomena): 1. Line-of-sight extraction of vapor-phase sample from high T, ambient P environment into mass spectrometer (P source /P Stage1 ≥ ) 2 mm orifice mm skimmer Stage 1 Stage 2 Stage 3 10 3 Torr Torr 7 Torr L/s L/s L/s Formation of molecular beam 2.

Supersonic expansion. Falconer's 84 research works with 1, citations and 1, reads, including: Abstraction by hydrogen atoms from ethylene, propylene, butene‐1, and cis‐ and trans‐butene‐2.

A flame-sampling molecular-beam photoionization mass spectrometer, recently designed and constructed for use with a synchrotron-radiation light source, provides significant improvements over previous molecular-beam mass spectrometers that have employed either electron-impact ionization or vacuum ultraviolet laser photoionization.

These include superior signal-to-noise. Figure 7 shows a typical mass spectrum of the supersonic expansion of 1,3-dimethyluracil vapors (A) and the PIE curves of the three main features (the monomer at m/zprotonated monomer at m/zand the 1,3-dimethyluracil dimer at m/z ) as extracted from a VUV scan between 8 eV and 10 eV (B).

The gray shadow is the standard deviation from three consecutive scans. MAX - Molecular Beam Mass Spectrometer The MAX-Molecular Beam Mass Spectrometer is a compact skimmer inlet system designed for accurate and reproducible identification of reactive and intermediate chemical species from a wide range of applications in plasma chemistry, atmospheric chemistry, combustion and gasification processes, cluster.

Mass Spectrometry has now become a crucial technique for almost all proteomics experiments. It allows precise determination of the molecular mass of peptides as well as their sequences.

This information can very well be used for protein identification, de novo sequencing, and identification of post-translational modifications. The pertinence of the Kantrowitz and Grey theory of aerodynamic molecular beams to the problem of sampling high‐pressure systems with a mass spectrometer is discussed.

A simple differentially pumped molecular beam system is described, which gives molecular beams of intensities of about 10 17 molecules/cm 2 /sec from 1‐atm sources. 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.

Elementary gas phase reactions have been studied with high‐intensity crossed molecular beams. A detailed analysis is presented on the sensitivity factors involved in mass spectrometric detection of free radicals formed in ordinary chemical reactions as contrasted to surface ionization detection of the products of alkali atom reactions.

Free radicals have been observed in a number of. molecular beam mass spectrometry. Quantifying plasma chemistry products at atmospheric pressure.

By Georgia Longstaff on Octo An atmospheric plasma produces many species. But which ones, and what role do they play. We take a closer look. Contact. Laser flash photolysis study of photodehydroxylation phenomena of 9-phenylxanthenol and photobehavior of related intermediates.

Enhanced electrophilicity of 9-phenylxanthenium cation singlet A high-intensity molecular beam of vinyl and ethynyl radicals. Joel A. Blush, Evidence for formation of gaseous methyl radicals in the. molecular beam method has been adapted for use in the present photo­ ionization mass spectrometric studies.

The advantages of this method have been demonstrated in a series of molecular-beam photoionization ^ J. studies. Charge transfer reaction is one of the most interesting processes when an ion collides with a neutral atom or molecule.

Molecular Beam Mass Spectrometry Flat flame MBMS technique has been proven to be a very powerful tool to study combustion chemistry of hydrocarbon fuels by providing one-dimensional concentration profiles of radicals and stable species.

technique to measure fl uxes of ions and neutral species is molecular beam mass spectrometry. The main characteristic is that the identity of the sampled species is preserved from creation at atmospheric pressure to vacuum monitoring by the rapid expansion of the formed molecular beam that “freezes out” any chemical reactions occurring.

mass spectrometry 1. mass spectrometry submitted by: princy agarwal m. pharma. [quality assurance] 2. contents introduction history principle mass spectrometer components of mass spectrometer esi [electrospray ionization] maldi [matrix assisted laser seorption ionization] fab [fast atom bombardment] field desorption plasma desorption apci [atmospheric pressure chemical ionization].

Figure 7 shows a typical mass spectrum of the supersonic expansion of 1,3-dimethyluracil vapors (A) and the PIE curves of the three main features (the monomer at m/zprotonated monomer at m/zand the 1,3-dimethyluracil dimer at m/z ) as extracted from a VUV scan between 8 eV and 10 eV (B).

The gray shadow is the standard deviation. Rizzo TR, Park YD, Levy DH () A molecular-beam of tryptophan. J Am Chem Soc (1)– Google Scholar.

IUPAC RECOMMENDATIONS Molecular beam mass spectrometry ; Mass spectrometry measurement in which the sample is introduced into the ion source of the mass spectrometer as a collimated beam of molecules with a narrow velocity distribution.: Related Term(s): Reference(s): D.

Olander, W. Waddel. Anal. Chem. 40, (). The molecular ion (m/z= Da) is not observed under electron impact ionization conditions. The highest mass ion (m/z=85) is due to an alpha-cleavage of ethyl; the other alpha-cleavage generates m/z= The rearrangement cleavage shown here generates the m/z=56 ion.

4,4-dimethylcyclohexene. A molecular beam mass spectrometry system for in situ measurement of the concentration of gas phase species including radicals impinging on a substrate during thermal plasma chemical vapor deposition (TPCVD) has been designed and constructed. Dynamically controlled substrate temperature was achieved using a variable thermal contact resistance.

This study illustrates the use of MBRS for surface reaction mechanistic studies in the milli- second time scale. Introduction The application of molecular beam relaxation spectrometry (MBRS) to the study of high temperature heterogeneous reactions has led to the identification of.

Molecular-beam photoionization studies of molecules and their van der Waals clusters Technical Report Ono, Y A new photoionization apparatus incorporating a supersonic molecular beam, a quadrupole mass spectrometer and a 3-meter vacuum ultraviolet monochromator has been used to study the nitric oxide, carbon disulfide, carbonyl sulfide and.modern day mass spectrometry, was the observation by Alfred Benninghoven in Münster that with energetic ion beams, simple organic molecules could be desorbed intact as ions from surfaces [7].

Since the beam created damage through bond-breaking and molecular .sumoto 13 used basic mass spectroscopy of a low power quartz-discharge-tube plasma using CO 2 CH 4 Ar mixtures to measure the concentrations of some of the gas phase species, but only a single gas mixture was investigated.

The present work uses the much more powerful technique of in situ molecular beam mass spectrometry MBMS to detect simultane-Ž.