Accession Number : ADA304760

Title :   Calculations of Second Moments of NQR Signals for Explosive Materials.

Descriptive Note : Rept. for 3 Jan-3 Aug 95,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC GARROWAY SECTION

Personal Author(s) : Snowel, Jolanta M.

PDF Url : ADA304760

Report Date : 10 JAN 1996

Pagination or Media Count : 60

Abstract : Calculations of the second moments of Nuclear Quadrupole Resonance (NQR) signals are presented in this report. Numerical computations are performed for two explosive materials: cyclotrimethylene-trinitrarnine, RDX, and cyclotetramethylene, Beta-HMX. The report includes a discussion of vector and tensor analysis necessary for performing calculations in the nonorthonormal coordinate systems. The basic theory for calculations of second moments is described and the procedure for numerical computations is outlined. The listings of MATLABe programs are also included. calculations are performed for nuclei with spin I = 1 and asymmetric field gradient. For cases under consideration no external magnetic field is present. Calculations of the second moments include first order contributions due to dipolar interactions between completely equivalent nuclei and interactions between nuclei with the EFG tensors of the same magnitude but different orientation. The second order contributions from dipolar interactions between nitrogen and hydrogen nuclei are also considered.

Descriptors :   *QUADRUPOLE MOMENT, *RDX, *HMX, *NUCLEAR QUADRUPOLE RESONANCE, MATHEMATICAL MODELS, SIGNAL PROCESSING, MAGNETIC FIELDS, CRYSTAL STRUCTURE, MATRICES(MATHEMATICS), NUMERICAL ANALYSIS, X RAY DIFFRACTION, EIGENVECTORS, ELECTRIC FIELDS, ELECTRON SPIN RESONANCE, NITROGEN, HYDROGEN, CONVERGENCE, VECTOR ANALYSIS, MOLECULAR STRUCTURE, NEUTRON DIFFRACTION, MOLECULE MOLECULE INTERACTIONS, NUCLEI, ATOMIC STRUCTURE, DIPOLE MOMENTS, MAGNETIC DIPOLES, NUCLEAR MAGNETIC MOMENTS, TENSOR ANALYSIS.

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Ammunition and Explosives
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE