jpcrd nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue

Oct 1975

Volume 4, Issue 3, pp. 471-856


Atomic form factors, incoherent scattering functions, and photon scattering cross sections

J. H. Hubbell, Wm. J. Veigele, E. A. Briggs, R. T. Brown, D. T. Cromer, and R. J. Howerton

J. Phys. Chem. Ref. Data 4, 471 (1975); http://dx.doi.org/10.1063/1.555523 (68 pages) | Cited 102 times

Full Text: | Download PDF

Show Abstract
Tabulations are presented of the atomic form factor, F (α,Z), and the incoherent scattering function, S (x,Z), for values of x (=sin ϑ/2)/λ) from 0.005 Å−1 to 109 Å−1, for all elements A=1 to 100. These tables are constructed from available state‐of‐the‐art theoretical data, including the Pirenne formulas for Z=1, configuration‐into action results by Brown using Brown‐Fontana and Weiss correlated wavefunctions for Z=2 to 6 non‐relativistic Hartree‐Fock results by Cromer for Z=7 to 100 and a relativistic K‐shell analytic expression for F (x,Z) by Bethe Levinger for x≳10 Å−1 for all elements Z=2 to 100. These tabulated values are graphically compared with available photon scattering angular distribution measurements. Tables of coherent (Rayleigh) and incoherent (Compton) total scattering cross sections obtained by numerical integration over combinations of F2(x,Z) with the Thomson formula and S (x,Z) with the Klum‐Nishina Formual, respectively, are presented for all elements Z=1 to 100, for photon energies 100 eV (λ=124 Å) to 100 MeV (0.000124 Å). The incoherent scattering cross sections also include the radiative and double‐Compton corrections as given by Mork. Similar tables are presented for the special cases of terminally‐bonded hydrogen and for the H2 molecule, interpolated and extrapolated from values calculated by Stewart et al., and by Bentley and Stewart using Kolos‐Roothaan wavefunctions.
Show PACS
78.70.Ck X-ray scattering

Binding energies in atomic negative ions

H. Hotop and W. C. Lineberger

J. Phys. Chem. Ref. Data 4, 539 (1975); http://dx.doi.org/10.1063/1.555524 (38 pages) | Cited 108 times

Full Text: | Download PDF

Show Abstract
A survey of the electron affinity determinations for the elements up to Z=85 is presented, and based upon these data, a set of recommended electron affinities is established. Recent calculations of atomic electron affinities and the major semiempirical methods are discussed and compared with experiment. The experimental methods which yield quantitative electron binding energy data are described and intercompared Based primarily upon extrapolation techniques, fine structure splittings for these ions and excited state term energies are given.
Show PACS
32.10.Hq Ionization potentials, electron affinities
32.80.Fb Photoionization of atoms and ions
32.80.Hd Auger effect (including Coster-Krönig transitions)
32.10.Fn Fine and hyperfine structure

A survey of electron swarm data

J. Dutton

J. Phys. Chem. Ref. Data 4, 577 (1975); http://dx.doi.org/10.1063/1.555525 (280 pages) | Cited 52 times

Full Text: | Download PDF

Show Abstract
An electron swarm consists of a small number density n of electrons in a gas of much higher number density N. The mean energy and energy distribution of such a swarm are determined by the value of E/N where E is the electric field. At any given value E/N the swarm may be characterized by the values of eight parameters, viz; drift velocity, diffusion coefficient. (diffusion coefficient/mobility, excitation coefficient, electron attachment coefficient, electron detachment coefficient, ionization coefficient, recombination coefficient. In this survey, data on these parameters obtained by a variety of experimental techniques are collected, discussed, and compared graphically. Also included on the graphs are computed values of the parameters obtained in many cases from cross sections and energy distributions chosen to give the best fit with the swarm data. Selected tabulations of the data are also given except in cases for which the accuracy of the data is not sufficient to warrant numerical presentation. The mean energy of the electron swarms ranges from thermal to several electron volts and the gases for which data are given are the rare gases, the common molecular gases (H2, N2, O2, CO, NO, CO2, NO2) and air. The survey also contains an extensive bibliography which includes references (i) to publications on electron swarms in a much wider range of gases than those for which data are given and (ii) to papers concerned with energy distributions, conductivity and ionization coefficients in crossed electric and magnetic fields in addition to those relating to the eight parameters listed above.
Show PACS
52.25.Fi Transport properties
34.80.-i Electron and positron scattering
52.80.-s Electric discharges
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close