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Friday, May 15, 2020 | History

3 edition of Absolute photoionization cross sections of atomic oxygen found in the catalog.

Absolute photoionization cross sections of atomic oxygen

Absolute photoionization cross sections of atomic oxygen

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Published by National Aeronautics and Space Administration in [Washington, D.C.? .
Written in English

    Subjects:
  • Photoionization of gases,
  • Oxygen

  • Edition Notes

    StatementJames A.R. Samson and P.N. Pareek
    SeriesNASA-CR -- 173873, NASA contractor report -- 173873
    ContributionsPareek, P. N, United States. National Aeronautics and Space Administration
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14928910M

    Absolute single photoionization cross-section measurements of Rb 2+ ions were performed using synchrotron radiation and the photo-ion, merged-beams technique at the Advanced Light Source at Lawrence Berkeley National Laboratory. Measurements were made at a photon energy resolution of ± meV from to eV spanning the 2 P ground state and 2 P metastable state ionization. Photoionization cross sections for atomic oxygen and nitrogen have been measured from their respective thresholds to Å (for 0) and to R (for N). Previously unobserved structure in atomic oxygen is reported between and R. Data which extends the atomic nitrogen cross sections to Å and data on the cross section for 02+ production are currently being analyzed.

    This book presents the results of atomic calculations of subshell and total photoionization cross-sections and asymmetry parameters as a function of photon energies below KeV. The book provides graphical data for the dipole-length approximation and includes ASCII text data on floppy diskettes for all approximations calculated in the same by: Single and double photoionization cross sections of atomic nitrogen from threshold to 31 A. J. A. R. Samson & G. C. Angel, , Phys. Rev. A, 42, Table 1. Absolute experimental total photoionization cross sections of N I. Description ( K), ASCII ( K). Total photoionization cross sections of atomic oxygen from threshold to A.

    Photoionization cross sections of atomic oxygen and dissociative photoionization cross sections of molecular oxygen were measured from their respective thresholds to angstrom by use of a photoionization mass spectrometer in conjunction with a spark light source. The measured absolute photoionization cross sections of atomic oxygen are tabulated in Table I and are shown in Fig. 3 along with the previous experimental results. The results by Cairns and samson2 were influenced by autoionizing structure in atomic oxygen5s6 and possibly by structure in the excited 02(16) molecular species.


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Absolute photoionization cross sections of atomic oxygen Download PDF EPUB FB2

The absolute cross section for photoionization of atomic oxygen from the 2p4 3P ground state of O(0) to the 2p3 4S ground state of O(+) has been measured at five narrow wavelength intervals between and nm.

The cross section near the 2p3 4S threshold is Mb + or - 7%.Cited by: Absolute cross sections for 2s-electron photoionization of atomic oxygen into the final ionic states O + (2s-1 4 P e, 2 D e, 2 S e, 2 P e) and for the occupation of the O + (3s 2,4 P e) satellite states have been determined experimentally by photon-induced fluorescence spectroscopy.

Comparison of the experimental results with theoretical predictions using multiconfiguration-interaction wavefunctions. Get this from a library. Absolute photoionization cross sections of atomic oxygen. [James A R Samson; P N Pareek; United States. National Aeronautics and Space Administration.].

Absolute cross sections for 2s-electron photoionization of atomic oxygen into the final ionic states O (2s 14 P e, 2 D e, 2 S e, 2 P e)and for the occupation of the O (3s 2,4 P e) satellite. Behlen Laboratory of Physics.

Total photoionization cross sections of atomic oxygen from threshold to SA G.C. Angel and James A.R. Samson. J I (I •.

Comparison of the initial methyl signal with the decrease in precursor signal, in combination with previously measured absolute photoionization cross-sections of the precursors, yields the absolute photoionization cross-section of the methyl radical; σCH3( eV) = ( ± ) × 10−18 cm2 and σCH3( eV) = ( ± ) × 10−18 by: que, the first absolute photoionization cross section measurement for a positive ion was obtained for Ba+ in (Lyon etal).This wasfollowedbythefirstgroup of absolute photoionization cross sections in Ca+ (Lyon et al.

b), Sr+ (Lyon, Peart, & Dolder a), K+ (Peart & Lyon ), and Ga+ and Zn+ (Peart, Lyon, & Dolder ). The absolute cross section for photoionization of atomic oxygen from the 2p4 3P ground state of O(0) to the 2p3 4S ground state of O(+) has been measured at five narrow wavelength intervals between and nm.

The cross section near the 2p3 4S threshold is Mb + or - 7%. Absolute photoionization cross section sigma is derived, yielding sigma=+/ Mb at the maximum of the resonance.

In addition, weak contributions to the O((1)D) yield from dissociative ionization originating from molecular singlet oxygen [O(2)((1)Delta(g))] are identified as by: 2. Keywords: surfaces, SEM, Auger, atomic oxygen, oxidation, sputtering 1. INTRODUCTION Atomic oxygen is one of the main consti-tuents in the atmosphere at low earth orbit.

The atomic oxygen oxidation of metals has been the topic of several studies. For the explanantion of the mechanisms see ref. Interaction of atomic oxygen with various. Finally, the photoionization yield of the iodine atom in its ground state 2P3/2 has been recorded using the synchrotron source and calibrated for the first time on an absolute cross section scale from our fixed nm laser measurement, σiI2P3/2 = 74−23+33 Mb (95% confidence interval).Cited by: The R-matrix method is used to obtain cross-sections for the photoionization of atomic oxygen from the 2s 2 2p 43 P state of O to the 2s 2 2p 34 S o, 2 D o, 2 P o and 2s2p 44 P, 2 P states of O +.

Ea for the 4 S o and the 2 D o O + states are shown to be reliable but the present results reveal considerable discrepancies for the other final ion states, in particular for the 4 P and 2 P states for which an inner Cited by: The experimental knowledge of partial cross-sections for photoionization of nitrogen atom is much less detailed than it is for those of the noble gases, or even lithium or atomic oxygen.

The absolute partial cross-sections are calculated using photoelectron spectroscopy and photoionization mass spectrometry. Abstract. The technique of two-photon excited fluorescence has been used to measure the cross section for the 3p 3 P 2,1,0atomic oxygen.

Excitation was monitored by observing fluorescence at nm from the 3p 3 P 2,1,>3s 3 S 1 transition. Spontaneous Raman scattering from H 2 was used to calibrate the fluorescence collection system. The spatial and Cited by: The absolute single-photoionization cross sections of singly charged nitrogen and oxygen ions have been measured from eV and eV, respectively, by merging a synchrotron-radiation beam from an undulator with a 2 keV ion beam.

a consensus for the best description of the photoionization cross section for neutral atomic oxygen. To this end, it is ad-vantageous to create a single photoabsorption model that is transparent to all atomic data users. This is most easily accom-plished by formulating an analytical expression that includes all.

The fragmentation cross sections for O(\u27+) were then obtained by subtraction of O(,2)(\u27+) cross sections from the known total photoionization cross sections. The results are compared with the previously published measurements.^ The absolute photoionization cross section of atomic oxygen, (sigma)(,0+), was measured at (ANGSTROM).Author: PREM NARAYAN PAREEK.

Indeed, using the same procedure and omitting the atomic oxygen production, we obtained a photoionization cross section of Mb which is about 2 Mb below the corrected value ( Mb). To make sure that the detected photoionized atomic oxygen resulted from the reactivity of water with the fluorine atoms, we have checked that S O + recorded under different experimental conditions was Cited by: 2.

Atomic and Molecular Photoabsorption: Partial Cross Sections is a companion work to Joseph Berkowitz's earlier work, Atomic and Molecular Photoabsorption: Absolute Total Cross Sections, published with Academic Press in In this work Joseph Berkowitz selected the "best" absolute partial cross sections for the same species as included in the companion work.

Abstract. Absolute cross-sections for the K-shell photoionization of Be-like (O 4 +) and Li-like (O 5 +) atomic oxygen ions were measured for the first time (in their respective K-shell regions) by employing the ion–photon merged-beam technique at the SOLEIL synchrotron-radiation facility in Saint-Aubin, -resolution spectroscopy with E/ΔE ≈ (≈ meV, full width at half Cited by:.

Determination of absolute photoionization cross sections of the phenyl radical Niels E. Sveum,ab Scott J. Goncherab and Daniel M. Neumark*ab Received 3rd OctoberAccepted 5th December First published as an Advance Article on the web 20th December DOI: /bk.The absolute photoionization cross section of ground state K+ ions has been measured from the 3p threshold to above the 3s threshold ( eV) by VUV radiation using a merged ion-photon beam set-up.Electronic excitation spectra and absolute differential oscillator strengths (cross sections) have been measured from the visible up to the soft X-ray energy regions ( eV) for the valence-shell photoabsorption of a series of normal alkanes (C₅H₁₂, C₆H₁₄, C₇H₁₆, and C₈H₁₈), single carbon Freons (CFCl₃, CF₂CI₂, CF₃CI, and CF₄), nitrogen dioxide (NO₂) and.