Results 261 to 270 of about 799,637 (297)

Odd-even effects for number of atoms in antiferromagnetic atomic chains on ferromagnetic substrate

Physics of the Solid State, 2010
The ground state of an antiferromagnetic atomic chain on a ferromagnetic substrate has been studied taking into account the single-ion anisotropy energy. Qualitatively different behavior of even and odd atomic chains has been demonstrated. A phase diagram in terms of chain length-ferromagnet exchange field has been constructed.
A. A. Berzin, A. I. Morosov, A. S. Sigov
openaire   +1 more source

Determination of effective atomic numbers, effective electrons numbers, total atomic cross-sections and buildup factor of some compounds for different radiation sources

Radiation Physics and Chemistry, 2017
Abstract The photon interaction parameters such as mass attenuation coefficient, effective atomic number, effective electron density, buildup factor have been measured for Fe(NO3)3, V4O2, NaCO3·H2O, C6H5FeO7·H2O and CuCI compounds using 137Ba, 157Gd and 241Am γ-rays sources in stable geometry.
Levet, Aytaç, Özdemir, Yüksel
openaire   +2 more sources

Effective atomic number rule to exchange energy

1995
This chapter assesses the effective atomic number rule. The effective atomic number rule applies to molecules where covalent bonding is strong and all the valence orbitals are being used in either homo- and hetero-polar covalent bonds or are occupied by non-binding electron-pairs.
openaire   +1 more source

Effective Atomic Numbers of Low-Z Compounds for Photon Interaction

Nuclear Science and Engineering, 1997
Effective atomic numbers are derived for the low-Z compounds polyethylene, polycarbonate, Teflon, Mylar, polystyrene, and polyvinyl chloride for total photon interaction in the 10- to 20000-keV energy region. The number generally decreases and then increases with increasing energy.
S. Guru Prasad, K. Parthasaradhi, W. D. Bloomer   +2 more
openaire   +1 more source

Photon attenuation coefficient and effective atomic number study of cements

Applied Radiation and Isotopes, 1993
Abstract The mass attenuation coefficients μ c ρ and the effective atomic numbers of four different cements have been calculated for total and partial photon interaction processes in the energy range 0.001–100,000 MeV. Small variations were noted in the mass attenuation coefficients due to chemical composition of cements for total and ...
G.S. Bhandal, K. Singh
openaire   +1 more source

Effective density and atomic number determined from diffraction profiles

SPIE Proceedings, 2006
X-ray diffraction (XRD) profiles are conventionally used to determine lattice spacings via Bragg's law in order to characterize crystalline materials. It does not appear to be widely known that they also permit compositional information, such as effective atomic number and a density descriptor, to be determined from materials having little or no ...
openaire   +1 more source

Atomic-number dependence of relativistic effects on chemical bonding

2000
Abstract The Atomic-number dependence of the relativistic effects on chemical bonding has been studied using the difference (ΔAPB) in the bond overlap populations between the relativistic and nonrelativistic DV-Xα calculations for various XH diatomic hydrides (XCu, Ag, and Au) and XF 6 hexafluorides (XS, Se, Mo, Ru, Rh, Te, W, Re, Os, Ir, Pt, U ...
openaire   +1 more source

The Effective Atomic Number

Radiation Research, 1957
T, HENRIKSEN, J, BAARLI
openaire   +2 more sources

Effective Atomic Numbers for Fe–Mn Alloy Using Transmission Experiment

Chinese Physics Letters, 2007
The effective atomic numbers (Zeff) and effective electron density (Ne) for Fe–Mn alloy with different Mn contents are calculated using the mass attenuation coefficients μ/ρ obtained via XCOM in the photon energy range of 1 keV–1 GeV. The results are compared with the values measured at the photon energy of 662, 1170 and 1332 keV.
openaire   +2 more sources

Determination of the effective atomic numbers of light composite materials

2009 IEEE Intrumentation and Measurement Technology Conference, 2009
The analysis of physical and chemical characteristics of materials (composite or not) via the determination of change in the effective atomic number (Zeff) can be performed by measuring the relation between the intensities of γ-rays under coherent (Rayleigh) and inelastic (Compton) scattering.
openaire   +1 more source