2 edition of An x-ray analysis database of photoionization cross sections including variable ionization found in the catalog.
An x-ray analysis database of photoionization cross sections including variable ionization
by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va
Written in English
|Statement||Ping Wang ... [et al.].|
|Series||[NASA contractor report] -- NASA-CR-204404., NASA contractor report -- NASA CR-204404.|
|Contributions||Wang, Pʻing., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Version was released in May , provided a new database of non-dipole photoionization cross sections, necessary for simulations of X-ray photoelectron intensities with X-ray energies higher than a . JETP Letter Ionization Cross Section Random Phase Approximation Photoionization Cross Section Spectroscopic Factor These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm by: 1.
X-ray interactions: photoabsorption, scattering, transmission, and reflection at E= eV, Z=, Atomic Data and Nuclear Data Tables Vol. 54 (no.2), (July ). By Eric Gullikson. Please send me your comments. calculated cross sections was %. Further information on estimates of uncertainties of cross sections from the database is given in Appendix A. No evaluations have yet been made of the calculated cross sections for inner-shell ionization by positrons because of the paucity of experimental data.
The time evolution of the electron density and the resulting time dependence of Fourier components of the X-ray polarizability of a crystal irradiated by highly intense femtosecond pulses of an X-ray free-electron laser (XFEL) is investigated theoretically on the basis of rate equations for bound electrons and the Boltzmann equation for the kinetics of the unbound electron gas. • Cross-sections from Hartree-Fock calculations are utilized for both valence-shell and inner-shell transitions. Radiative recombination rate coefficients are calculated from the photoionization cross-sections. • Electron collisional excitation and ionization cross-sections • Distorted-wave (DW) calculations are performed to generate File Size: 1MB.
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Get this from a library. An X-ray analysis database of photoionization cross sections including variable ionization. [Ping Wang; United States. National Aeronautics and Space Administration.;]. Figure 1. Total cross section for two cosmically abundant plasmas.
The dotted line is for a fully neutral plasma and the solid line is for a warm, photoionized hot star wind. Note the large decrease in soft X-ray opacity due primarily to helium ionization.
Note also the shifting to. Results of research efforts in the following areas are discussed: review of the major theoretical and experimental data of subshell photoionization cross sections and ionization edges of atomic ions to assess the accuracy of the data, and to compile the most reliable of these data in our own database; detailed atomic physics calculations to complement the database for all ions of 17 cosmically abundant elements; reconciling the data.
IONeq: An X-ray absorption model including ionization equilibrium conditions. IONeq is an X-ray high-resolution photoabsorption model which computes the optical depth τ(E) simultaneously for ions of all abundant elements, assuming ionization equilibrium and taking into account turbulent broadening.
This model has been developed by Efrain Gatuzz and Eugene Churazov. The relative intensities can, in principle, be determined from photoioniration cross sections at X-ray energies. which have been calculated from a HartreeSlater model by a number of workers '], or they can he obtained directly from experimental by: Single photoionization cross sections for Kr-like Rb$^+$ ions are reported in the energy (wavelength) range 22 eV ( \AA) to 46 eV ( \AA).
the characteristic X-ray energy must be high enough to eject core electrons for an unambiguous analysis; 3. the photoionization cross section of e in different core levels varies with the wavelength of the X-ray, a suitable characteristic X-ray wavelength is crucial to obtain a strong enough photoelectron signal forFile Size: 1MB.
The relations between photoionization cross sections and photon radius are obtained on basis of quantum mechanics and the particle-like properties of a photon. The photoionization cross sections of H atom and H-like ions, He atom and He like ions, alkali metal atoms, and Rydberg atoms are calculated using the Size: KB.
A library for X-ray–matter interaction cross sections for X-ray fluorescence applicationsB A. Brunettia,b,*, M. Sanchez del Rioc, B.
Golosiob,c, A. Simionovicic,d, A. Somogyic aIstituto di Matematica e Fisica, Universita’ di Sassari, via Vienna 2, Sassari, Italy bINFN, Sezione di Cagliari, Italy cEuropean Synchrotron Radiation Facility, 6 rue Jules Horowitz, Grenoble Cedex, France.
An anomalous photoionization cross section ratio (60%) between the 26+ 1=2 and 25 3=2 states was observed. The chemical environment of an atom affects the ionization energies of valence and core orbitals. The recent progress in synchrotron radiation instrumentation and electronCited by: 9.
photoionization cross-section σ ω3,3s p (), but σ β3,3 3,3s p s p(1)+. We have calculated the cross sections and angular anisotropy parameters, dipole and non-dipole, in the frame of one electron Hartree-Fock (HF) approach and with account of RPAE multi-electron correlations.
At eV, the photoionization cross sections for the phenyl radical averaged over product channels were found to be and Mb, respectively, with very little eﬀect seen from the range of internal excitation produced at the two photolysis wavelengths.
Photoionization and total absorption cross sections have been measured for CO 2, CO, Ar, and He at the wavelengths in the region A to A which correspond to intense solar emission wavelength resolution, determined from the measured width of each of the spectral lines generated within the light sources, was in the range to by: D.
Donnelly et al.: Photoionization cross sections for Fe XVIII therefore investigate the L-shell photoionization of Fe XVIII using the R-matrix method to obtain both total and partial photoionization cross sections.
Method We employ the Breit-Pauli R-matrix method (Scott & Burke ) to calculate the photoionization cross by: 1. X-ray photoionization of hydrogen in the presence of a bichromatic laser field is considered. The expressions for the T matrix and the cross sections for the laser-assisted x-ray photoionization are presented.
The initial state is the laser-field-dressed hydrogen-atom ground state, while the final state is the improved Coulomb-Volkov wave. The continuous variation of x‐ray photoabsorption cross sections of molecular oxygen has been obtained experimentally between 6 and 22 Å.
An empirical formula has been deduced for the variation of the absorption coefficient in this range and compared with other semiempirical estimations. Moreover, the experimental results are compared with the theoretical values calculated from Stobbe’s Cited by: 5.
Cross section is the cross-section in barns/atom -(1 barn = 10 24 cm2), u is the atomic mass unit A is the relative atomic mass of the target element (i.e.
in amu; the mass relative to 12 for carbon 12). Cross-section is a measure of the probability of interaction between the incident photons with the material via photoabsorption or scattering.
An x-ray analysis database of photoionization cross sections including Read. X-Ray spectra variability in NGC Read. X-Ray spectra variability in NGC Read.
EUV/soft x-ray spectra for low B neutron stars of accreting pulsars Read. An x-ray analysis database of photoionization cross sections including Read. An x-ray analysis. Scofield photoionization cross-section database combined with x-ray booklet binding energy database "Hartree-Slater subshell photoionization cross-sections at and eV" J.
Scofield, Journal of Electron Spectroscopy and Related Phenomena, (). Universal scaling of resonances in vector correlation photoionization parameters  O’Keeffe P, Alo ¨ ıse S, Fritzsche S, Lohmann B, Kleiman U, Meyer M and Grum-Grzhimailo A N Phys. 2. the characteristic X-ray energy must be high enough to eject core electrons for an unambiguous analysis; 3.
the photoionization cross section of e in different core levels varies with the wavelength of the X-ray, a suitable characteristic X-ray wavelength is crucial to obtain a strong enough photoelectron signal for Size: KB.The angular distribution of the photoelectrons in the case of free atoms and circularly polarized or unpolarized photons can be described by the formula developed by Cooper: (3) d σ i d Ω = σ i 4 π 1 − β 2 P 2 (cos θ) + γ 2 si n 2 θ + δ cos θ where dσ i /dΩ is the differential photoionization cross-section for the ith atomic subshell, σ i the total photoionization cross-section Cited by: Ionization X Ray le ionization Effects In X - Ray Emission Induced Brazilian Journal of Physics, vol.
36, no. 2B, June, Multiple Ionization Effects in X-Ray Emission Induced by Heavy Ions M. Czarnota, M. Pajek, D. Bana s,´.