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Research   Open Access

Total cross section measurements for positron scattering from acetone

Antonio Zecca, Luca Chiari, Emanuele Trainotti, Anindya Sarkar, Michael J Brunger PMC Physics B 2010, 3:4 (7 October 2010)

Abstract | Full text | PDF

Review   Open Access

MHD flow in an insulating rectangular duct under a non-uniform magnetic field

René Moreau, Sergey Smolentsev, Sergio Cuevas PMC Physics B 2010, 3:3 (1 October 2010)

Abstract | Full text | PDF

Mini-review   Open Access

Commentary on the superconducting and magnetic properties of the ruthenocuprates

Piotr W Klamut PMC Physics B 2010, 3:2 (13 July 2010)

Abstract | Full text | PDF |  Editor’s summary

Presented in this commentary is a short discussion of the superconducting and magnetic properties of the selected compounds of rutheno-cuprates, with an emphasis given to the RuSr2GdCu2O8 compound.

Research article   Open Access

Coherently driven degenerate three-level laser with parametric amplifier

Tewodros Y Darge, Fesseha Kassahun PMC Physics B 2010, 3:1 (24 March 2010)

Abstract | Full text | PDF |  Editor’s summary

We discuss the squeezing and statistical properties of the light produced by a coherently driven degenerate three-level laser with a parametric amplifier.

Research article   Open Access

Near-threshold electron-impact excitation of argon studied with the time-of-flight technique

Subhendu Mondal, Julian Lower, Stephen J Buckman, Robert P McEachran, Gustavo Garcia, Oleg Zatsarinny, Klaus Bartschat PMC Physics B 2009, 2:3 (18 December 2009)

Abstract | Full text | PDF |  Editor’s summary

Absolute angle-differential cross-section data are presented for excitation of the 3p54s manifold in argon by electron impact. The investigation focuses on the near-threshold region, where previous studies have revealed persistent disparities between measurements and theoretical predictions.

Research article   Open Access

He2+-He charge transfer collisions using a 27-state close-coupled calculation with a diabatic molecular basis

Chanchal Chaudhuri PMC Physics B 2009, 2:2 (9 June 2009)

Abstract | Full text | PDF |  Editor’s summary

A combined detailed analysis and comparison has been carried out to find a connection with the dynamic two-electron correlation picture in charge transfer collision processes which involve sequential/simultaneous two-electron exchange. If electron translation factors are included, the work may open up opportunities to investigate dynamic two-electron correlation effect in charge transfer ion-atom collision processes with benchmark accuracy.

Research article   Open Access

Electron excitation and energy transfer rates for H2O in the upper atmosphere

Penny Thorn, Laurence Campbell, Michael Brunger PMC Physics B 2009, 2:1 (2 January 2009)

Abstract | Full text | PDF |  Editor’s summary

Presented here are calculations of electron energy transfer rates for electronic and vibrational state excitations in H2O, as well as rates for excitation of some of these states by atmospheric thermal and auroral secondary electrons.

Research article   Open Access

Magnetic modulation in mechanical alloyed Cr1.4Fe0.6O3 oxide

RN Bhowmik, M Nrisimha Murty, E Sekhar Srinadhu PMC Physics B 2008, 1:20 (29 December 2008)

Abstract | Full text | PDF |  Editor’s summary

Cr1.4Fe0.6O3 compound is synthesized through mechanical alloying of Cr2O3 and Fe2O3 powders and subsequent thermal annealing. The XRD spectrum, SEM picture and microanalysis of EDAX spectrum are used to understand the structural evolution in the alloyed compound.

Research article   Open Access

Upper critical field Hc2 in Bechgaard salts (TMTSF)2PF6

Ana D Folgueras, Kazumi Maki PMC Physics B 2008, 1:19 (9 December 2008)

Abstract | Full text | PDF |  Editor’s summary

The symmetry of the superconductivity in Bechgaard salts is still unknown, though the triplet pairing has been established by Hc2 and NMR for (TMTSF)2PF6. Here we start with a low energy effective Hamiltonian and study the temperature dependence of the corresponding Hc2(T)'s.

Research article   Open Access

Mg spin affects adenosinetriphosphate activity

Alexander A Tulub PMC Physics B 2008, 1:18 (4 December 2008)

Abstract | Full text | PDF |  Editor’s summary

Schlegel-Frisch ab initio molecular dynamics (ADMP) (DFT:B3LYP), T = 310 K, are used to study complexation between adenosinetriphosphate (ATP), ATP subsystem, and magnesium cofactor [Mg(H2O)6]2+, Mg subsystem, in a water pool modeled with 78 water molecules. The computations prove that ATP cleavage is governed by the electron spin of Mg.

Research article   Open Access

Effect of biased noise fluctuations on the output radiation of coherent beat laser

Sintayehu Tesfa PMC Physics B 2008, 1:17 (1 December 2008)

Abstract | Full text | PDF |  Editor’s summary

The effects of biased noise fluctuations on the degree of squeezing and intensity of radiation both inside and outside the cavity of a one-photon coherent beat laser are presented.

Research article   Open Access

Evolution of structure of SiO2 nanoparticles upon cooling from the melt

Nguyen Xuan Huynh, Vo Van Hoang, Hoang Zung PMC Physics B 2008, 1:16 (30 October 2008)

Abstract | Full text | PDF |  Editor’s summary

Evolution of structure of spherical SiO2 nanoparticles upon cooling from the melt has been investigated via Molecular Dynamics simulations under non-periodic boundary conditions. Our results show significant temperature dependence of structure of nanoparticles, and we discuss the temperature dependence of the concentration of structural defects.

Research article   Open Access

Effect of the applied magnetic field on formation of complex polyaniline films

Oleg P Dimitriev, Petro M Lytvyn, Alla P Dimitriyeva, Ostap M Getsko PMC Physics B 2008, 1:15 (21 October 2008)

Abstract | Full text | PDF |  Editor’s summary

It has been found that an applied magnetic field affects the interaction of polyaniline chains with paramagnetic metal ion impurities, and induces formation of magnetically ordered regions in contrast to the reference film of the same composition but prepared under ambient conditions. Correlations are found between the distribution of magnetically ordered regions and peculiarities of the surface relief of a film.

Research article   Open Access

Rectified voltage induced by a microwave field in a confined two-dimensional electron gas with a mesoscopic static vortex

D Schmeltzer, Hsuan Chang PMC Physics B 2008, 1:14 (21 October 2008)

Abstract | Full text | PDF |  Editor’s summary

We investigate the effect of a microwave field on a confined two dimensional electron gas containing an insulating region comparable to the Fermi wavelength. A Bosonized formulation of the two dimensional gas in the presence of insulating regions allows us to compute the rectified current. The proposed theory may explain experimental results recently reported by J. Zhang et al.

Research article   Open Access

Ab-initio calculations of spin tunneling through an indirect barrier

Athanasios N Chantis, Titus Sandu, Jialei L Xu PMC Physics B 2008, 1:13 (6 June 2008)

Abstract | Full text | PDF |  Editor’s summary

We use a fully relativistic layer Green’s functions approach to investigate spin-dependent tunneling through a symmetric indirect band gap barrier like GaAs/AlAs/GaAs heterostructure. Our calculations show clearly that the appearance of energy windows with significant spin polarization depends mostly on the location of transmission resonances and their corresponding zeros and not on the magnitude of the spin splitting in the barrier.

Research article   Open Access

Electronic structure, linear, nonlinear optical susceptibilities and birefringence of CuInX2 (X = S, Se, Te) chalcopyrite-structure compounds

Ali Reshak, S Auluck PMC Physics B 2008, 1:12 (19 May 2008)

Abstract | Full text | PDF |  Editor’s summary

We present results for band structure, density of states, and the imaginary part of the frequency-dependent linear and nonlinear optical susceptibilities for CuInX2 (X=S, Se, Te) chalcopyrite-structure single crystals. We find that these crystals are semiconductors with direct band gaps, and have calculated their birefringence and frequency-dependent complex second-order non-linear optical susceptibilities.

Research article   Open Access

Synthesis, Infra-red, Raman, NMR and structural characterization by X-ray Diffraction of [C12H17N2]2CdCl4 and [C6H10N2]2Cd3Cl10 compounds

Iskandar Chaabane, Faouzi Hlel, Kamel Guidara PMC Physics B 2008, 1:11 (8 April 2008)

Abstract | Full text | PDF |  Editor’s summary

We report on the synthesis, crystal structure and infra-red, Raman and NMR spectra of 2, 4, 4- trimethyl-4, 5- dihydro-3H-benzo[b] [1, 4] diazepin-1-ium tetrachlorocadmate, [C12H17N2]2CdCl4 and benzene-1,2-diaminium decachlorotricadmate(II) [C6H10N2]2Cd3Cl10.

Research article   Open Access

Fast and accurate simulations of transmission-line metamaterials using transmission-matrix method

Hui Ma, Tie Cui, Jessie Chin, Qiang Cheng PMC Physics B 2008, 1:10 (8 April 2008)

Abstract | Full text | PDF |  Editor’s summary

Recently, two-dimensional periodically L and C loaded transmission-line (TL) networks have been applied to represent metamaterials. We propose an efficient transmission-matrix method (TMM) to simulate and analyze the TL-network metamaterials, which provides nearly the same simulation results as Agilent's Advanced Design System whilst greatly reducing model-processing and simulation times.

Research article   Open Access

Zone center phonons of the orthorhombic RMnO3 (R = Pr, Eu, Tb, Dy, Ho) perovskites

HC Gupta, Upendra Tripathi PMC Physics B 2008, 1:9 (17 March 2008)

Abstract | Full text | PDF |  Editor’s summary

A short range force constant model (SRFCM) has been applied for the first time to investigate the phonons in RMnO3 (R = Pr, Eu, Tb, Dy, Ho) perovskites in their orthorhombic phase.

Research article   Open Access

Optical second harmonic generation in Yttrium Aluminum Borate single crystals (theoretical simulation and experiment)

Ali H Reshak, S Auluck, A Majchrowski, IV Kityk PMC Physics B 2008, 1:8 (17 March 2008)

Abstract | Full text | PDF |  Editor’s summary

Experimental measurements of the second order susceptibilities for second harmonic generation are reported for YAl3(BO3)4 (YAB) single crystals. First principles calculations within a framework of the fullpotential linear augmented plane wave (FP-LAPW) method show a large anisotropy of the linear and nonlinear optical susceptibilities.

Research article   Open Access

Influence of sintering temperature on resistivity, magnetoresistance and thermopower of La0.67Ca0.33MnO3

G Venkataiah, YK Lakshmi, PV Reddy PMC Physics B 2008, 1:7 (12 March 2008)

Abstract | Full text | PDF |  Editor’s summary

A systematic investigation of La0.67Ca0.33MnO3 manganites looks at the influence of varying crystallite size (nano meter range) on electrical resistivity, magnetic susceptibility and thermoelectric power. The metal-insulator transition temperatures are found to increase with increasing sintering temperatures, while the magnetic transition temperatures decrease.

Research article   Open Access

Evidence of phonon-assisted tunnelling in electrical conduction through DNA molecules

Povilas Pipinys, Antanas Kiveris PMC Physics B 2008, 1:6 (19 February 2008)

Abstract | Full text | PDF |  Editor’s summary

We propose a phonon-assisted tunnelling model for explanation of some of the peculiarities of the dependence of the conductivity of DNA molecules on temperature.

Research article   Open Access

Interface coupling properties and reflection of bulk spin waves from biaxial multilayer ferromagnetic media

Sergey A Reshetnyak, Tat'yana A Homenko PMC Physics B 2008, 1:5 (14 February 2008)

Abstract | Full text | PDF |  Editor’s summary

The reflection coefficient of bulk spin waves from multilayer ferromagnetic structure is calculated with a non-ideal coupling between layers. The proposed model gives the opportunity to consider the quality of interfaces when studying the reflection processes of spin waves in multilayer structures.

Research article   Open Access

Microwave dielectric spectroscopy of pure and mixed aromatic ester solvents

Santiago Aparicio, Rafael Alcalde PMC Physics B 2008, 1:4 (12 February 2008)

Abstract | Full text | PDF |  Editor’s summary

The structure and dynamics of pure and mixed liquid aromatic esters is studied through microwave dielectric relaxation spectroscopy. Data are analyzed in terms of the proposed different species present in the fluids and their evolution with composition for mixtures, and with temperature and chain length for pure esters.

Research article   Open Access

Electron cooling by carbon monoxide in the atmospheres of Mars and Venus

Laurence Campbell, Michael J Brunger PMC Physics B 2008, 1:3 (4 February 2008)

Abstract | Full text | PDF |  Editor’s summary

Electron cooling, in which free electrons lose energy to vibrational excitation of gases, has been identified as a significant process in the atmospheres of Mars and Venus for electron impact on CO2. In this paper electron cooling rates for CO are calculated and compared with existing rates for CO2.

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