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Shiv Nadar University

(SoNS) School of Natural Sciences

A systematic procedure to study one-dimensional Schrödinger equation with a position-dependent effective mass (PDEM) in the kinetic energy operator is explored. The conventional free-particle problem reveals a new and interesting situation in that, in the presence of a mass background, formation of bound states is signalled. We also discuss coordinate-transformed, constant-mass Schrödinger equation, its matching with the PDEM form and the consequent decoupling of the ambiguity parameters. This provides a unified approach to many exact results known in the literature, as well as to a lot of new ones.

Physics

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Modern Physics Letters A

A general scheme for the effective-mass schrödinger equation and the generation of the associated potentials

The complete dynamic epitaxy of α-quartz during barium ion implantation is discussed. The nonimplanted sample is characterized by a very weak and broad peak at 2 electron volt in the red region. The Barium can be incorporated via dynamic SPEG in single-crystalline α-quartz hardly affecting the crystalline structure. The results show that the visible and ultraviolet peaks occurs at 2.42, 2.79, 3.4 and 4.2 electron volt respectively.

Applied Physics Letters

Cathodoluminescence versus dynamical epitaxy of Ba-ion irradiated alpha;-quartz

An analysis of structural features associated with polymorphism in 3-acetylcoumarin has been made in terms of morphology, infrared spectroscopy, crystal structure, powder X-ray diffraction, and differential scanning calorimetric measurements. The appearance of concomitant polymorphe is found to depend on the crystallization temperature in the 1:1 chloroform/hexane solvent system. C-H⋯O and C-H⋯π interactions stabilize one form in a head to head configuration, while only C-H⋯O interactions stabilize the other in a head to tail configuration of the molecules in the crystal lattice.

Chemistry

Crystal Growth and Design

Concomitant polymorphism in 3-acetylcoumarin: Role of weak C-H⋯O and C-H⋯π interactions

Several (2-substituted)-spiro(cyclohexane)-1′ ,5-[1,3,4]oxadiazolo[3,2-c]thiazolines 3 and (2-substituted)-spiro(cyclohexane)-1′,5-[1,3,4]thiadiazolo[3,2-c] thiazolines 6 have been synthesised from 3-arylamido-spiro(cyclohexane)-1′ ,2-(4-thiazolidinone) 2 and 3-(N-substituted arylthiocarbanilido)-spiro(cyclohexane)-1′,2-(4-thiazolidinone) 5 respectively which in turn have been prepared by reaction of 1-aroylcyclohexane-hydrazone 1 and 1-aryl-4-cyclohexane thiosemicarbazone 4 with thioglycollic acid respectively. The molluscicidal activity of few title compounds has been evaluated against snail Lymnaea acuminata.

Life Sciences

Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry

Synthesis and molluscicidal activity of (2-substituted)-spiro(cyclohexane)-1′,5-[1,3,4]oxa/thiadiazolo[3,2-c] thiazolines

In this paper we present the accelerated reliability testing of MgZnO based UV detectors. The UV detectors are fabricated on glass, quartz and sapphire substrates by Pulsed Laser Deposition (PLD) technique. The films are highly oriented and show sharp transmission at 350nm and 330nm for Mg composition of 10% and 20% in ZnO, respectively. The device response has been studied and life expectancy of the devices has been estimated from the accelerated tests.

Materials Research Society Symposium - Proceedings

Accelerated reliability test inputs in analyzing the device response of MgZnO based UV detector

The optical band gap (Eg) of Pb1-xFexS solution-grown nanoparticle films was varied from 2.65 to 2.22 eV with an increase in iron concentration 0.25 ≤ × ≤ 0.75 in films grown at fixed pH and temperature by the chemical bath deposition method. The presence of excitonic structure in the ternary Pb1-xFexS for x ≥ 0.50 suggests increasing binding energy with increase in iron concentration in the films. A shift of excitonic peak towards higher energy with an increase in iron concentration is also observed.

Nanotechnology

Size dependence of optical properties in solution-grown Pb1-xFexS nanoparticle films

Structural and electrical properties of silicon dioxide layers with embedded germanium nanocrystals grown by molecular beam epitaxy

In aqueous acidic media sodium azide and the orange-yellow title complex react quantitatively generating N2 gas along with a colourless solution of Ag+ ion and the ligand, ethylenebis(biguanide). The parent complex, [Ag(H2L)]3+, and one of its conjugate bases, [Ag(HL)]2+, participate in the reaction with N 3- as the kinetically reactive reductant. Ag+ has no catalytic effect. At 25.0 °C, I = 1.0 M (NaNO3), rate constants for the reactions [Ag(H2L)]3+ + N 3- and that for [Ag(HL)]2+ + N3 - are (12.3±0.5) and (3.8±0.6) M-1· S-1, respectively. The high rate constants along with the very low equilibrium constant (10-15 M-1) calculated for the first reaction strongly suggest inner-sphere redox mechanism. © Wiley-VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2003.

European Journal of Inorganic Chemistry

Kinetics of Oxidation of Azide by [Ethylenebis(biguanide)]silver(III) in Aqueous Acidic Media

Silicide formation and ion beam mixing of Fe/Si bilayers due to Ar-, Xe- and Au-ion irradiations at room and liquid-nitrogen temperatures were investigated. For the study of silicide phase formation, the Fe/Si bilayers were irradiated with 100-keV Ar + , 250-keV Xe + , 700-keV Xe 2+ or 400-keV Au + ions at fluences of 1 × 10 15 to 2 × 10 16 ions/cm 2 . The influence of the ion-charge state on the mixing process was studied in Fe/Si by 100-keV Ar 8+ -ion implantation, in addition to the corresponding irradiations with singly charged ions at the same energy. Changes in the samples were analyzed by Rutherford backscattering spectroscopy, conversion electron Mössbauer spectroscopy, X-ray diffraction and atomic force microscopy. Pronounced structural changes and the intermixing of the components at the Fe/Si interfaces were measured as a function of the ion species, ion fluence and sample temperature. A linear correlation between the interface broadening and the fluence was observed for all the cases. Mössbauer analysis with enriched 57 Fe layers revealed the onset of phase formation out of the solid solution. In order to interpret the mixing rates in this most general case, we considered mixing through thermal local or global spikes and compound formation. The highly charged Ar 8+ -ion irradiation produced a higher athermal mixing rate compared to singly charged Ar + ions, and this result could not be explained by the above models.

Applied Physics A: Materials Science and Processing

Ion-beam mixing in Fe/Si bilayers by singly and highly charged ions: Evolution of phases, spike mechanism and possible effects of the ion-charge state

The synthesis, characterization and physical properties of energetic azido binders were discussed. The energetic composites of glycidyl azide polymer (GAP)/nitroplasticizers and polyethylene glycol with HMX in various particle sizes were studied and compared with hydroxy terminated polybutadiene (HTPB) composites. The particle size of the oxidizer played an important role in determining the performance of the propellants. It was found that the flame structure of the GAP propellants was altered by the nature of the oxidizers.