Theoretical Compton profile anisotropies in molecules and solids. VII. Zero point Compton profile anisotropies and bond polarities in alkali halide diatomic molecules

1980 ◽  
Vol 72 (8) ◽  
pp. 4588-4590 ◽  
Author(s):  
Robert L. Matcha ◽  
Bernard M. Pettitt
Keyword(s):  
Alkali Halide ◽  
Diatomic Molecules ◽  
Zero Point ◽  
Compton Profile

On the Modified Form of Rittner's Potential Function

1972 ◽  
Vol 27 (5) ◽  
pp. 781-783 ◽  
Author(s):  
M. M. Patel ◽  
V. B. Gohel
Keyword(s):  
Potential Function ◽  
Alkali Halide ◽  
Diatomic Molecules ◽  
Original Form ◽  
Better Than ◽  
Made In

Abstract The modified form of the Rittner's potential function has been tested in it's ability to reproduce the ωeχe values of alkali halide diatomic molecules. The function has been compared with the original form of Rittner's potential. The comparison of the calculated values of ωeχe with those obtained experimentally shows that the modified form of the Rittner's potential is better than the original one. The reliability of the test made in the present study has been briefly discussed

Potential Energy Curves of Alkali Halide Diatomic Molecules

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1227-1228 ◽  
Author(s):  
M. M. Patel ◽  
V. B. Gohel
Keyword(s):  
Potential Energy ◽  
Potential Function ◽  
Ground State ◽  
Alkali Halide ◽  
Diatomic Molecules ◽  
Potential Energy Curves ◽  
Empirical Potential

Abstract R. K. R. curves have been constructed for the ground state of alkali halide diatomic molecules and compared with the well behaved empirical potential function. It is found that the modified form of Rittner's potential accurately reproduces the R. K. R. curves.

Single-Particle Momentum Distributions from Deep Inelastic Neutron Scattering (DINS)

1993 ◽  
Vol 48 (1-2) ◽  
pp. 415-424 ◽  
Author(s):  
Ralph O. Simmons
Keyword(s):  
Neutron Scattering ◽  
Single Particle ◽  
Inelastic Neutron Scattering ◽  
Noble Gas ◽  
Zero Point ◽  
Quantum Solids ◽  
Longitudinal Momentum ◽  
Compton Profile ◽  
Point Energy ◽  
Momentum Distributions

Abstract Single-particle longitudinal momentum distributions in condensed matter are now accessible to direct measurement using eV neutrons. Some systems of particular interest include a) quantum solids and fluids, formed from 3Hie, 4He, and H2 , b) prototype molecular crystals, formed from noble gases, c) fluids such as H2 and Ne, which show deviations from classical behavior and d) mixed systems, in which guest-host interactions may be important. Quantum solids can be investigated at substantially different densities, for different structures, and further, can be compared to the corresponding fluids, with which they have significant similarities in their single-particle properties such as their momentum distributions. Noble gas solids comprise a graduated family with progressively varying importance of zero-point energy, of phonon anharmonicity, and of multi-body forces. They have also been very useful for matrix isolation studies, and eV neutron scattering can yield their center-of-mass motions, not previously seen directly. Finally, noble gas fluids can be used to investigate the nature and extent of final-state effects in the neutron scatttering. Such effects are defined to be the difference between the longitudinal "neutron Compton profile" and the longitudinal momentum distribution.

Systematic effects in observed parallaxes

1978 ◽  
Vol 48 ◽  
pp. 31-35
Author(s):  
R. B. Hanson
Keyword(s):  
Error Estimates ◽  
Zero Point ◽  
Absolute Zero ◽  
Apparent Magnitude ◽  
Coherent System ◽  
Preliminary Results ◽  
General Catalogue ◽  
Systematic Effects ◽  
New Evidence ◽  
Right Ascension

Several outstanding problems affecting the existing parallaxes should be resolved to form a coherent system for the new General Catalogue proposed by van Altena, as well as to improve luminosity calibrations and other parallax applications. Lutz has reviewed several of these problems, such as: (A) systematic differences between observatories, (B) external error estimates, (C) the absolute zero point, and (D) systematic observational effects (in right ascension, declination, apparent magnitude, etc.). Here we explore the use of cluster and spectroscopic parallaxes, and the distributions of observed parallaxes, to bring new evidence to bear on these classic problems. Several preliminary results have been obtained.

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