Now showing items 21-30 of 41
Effect of recoil on the velocity distribution of metastable atoms produced by electron impact
(Elsevier, 1969-10-06)
We have shown both experimentally and by a simple kinematic argument that the velocity distribution in a beam of metastable atoms produced by electron bombardment of ground state atoms deviates strongly from the velocity ...
Partially Alternate Derivation of a Result of Nelson
(The American Institute of Physics, 1969-01)
The result of Nelson that the total Hamiltonian is semibounded for a self‐interacting Boson field in two dimensions in a periodic box is derived by an alternate method. It is more elementary in so far as functional integration ...
Spin Directions in Pure Chromium
(The American Institute of Physics, 1969-03-01)
We have carried out a triple‐axis polarized‐neutron‐beam experiment with polarization analysis of the final beam and magnetic fields to 15 kG applied to a pure Cr single crystal. The purpose was to determine whether the ...
Electron Densities from Gas‐Phase Electron Diffraction Intensities. II. Molecular Hartree–Fock Cross Sections
(The American Institute of Physics, 1969-10-01)
Differential cross sections for electron scattering based on molecular Hartree–Fock electron densities are compared with cross sections based on the independent‐atom approximation for the molecules C2, N2, O2, F2, and CO. ...
Electron‐Diffraction Structural Study of Polymeric Gaseous Hydrogen Fluoride
(The American Institute of Physics, 1969-04-15)
Electron diffraction patterns with molecular interference features extending beyond s = 35Å−1s=35Å−1 were obtained for gaseous self‐associated HF introduced under its own vapor pressure at −19° and at +22°C through a ...
Electron Densities from Gas‐Phase Electron Diffraction Intensities. I. Preliminary Considerations
(The American Institute of Physics, 1969-10-01)
The intensity of electrons and x rays scattered by a freely rotating molecule is determined, in the kinematic approximation, solely by the nuclear–nuclear, electron–nuclear, and electron–electron radial distribution functions ...
Relationships among Generalized Phase‐Space Distributions
(The American Institute of Physics, 1969-02)
The generalized phase‐space distributions, including the Wigner distribution, are presented in terms of expected values of generating operators. A generalization of the Weyl correspondence is obtained to provide expressions ...
Invariant Imbedding and Case Eigenfunctions
(The American Institute of Physics, 1969-04)
A new approach to the solution of transport problems, based on the ideas introduced into transport theory by Ambarzumian, Chandrasekhar, and Case, is discussed. To simplify the discussion, the restriction to plane geometry ...
Raman Spectra and Vibrational Assignments for Trimethylamine
(The American Institute of Physics, 1969-02-01)
Half‐Space Multigroup Transport Theory
(The American Institute of Physics, 1969-12)
A method for solving various half‐space multigroup transport problems for the case of a symmetric transfer matrix is explained. This method is based on the full‐range completeness and orthogonality properties of the ...