A5102008986- Nuclear physics research studies
- Atomic and Molecular Physics
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Nanocluster Synthesis and Applications
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Semiconductor Quantum Structures and Devices
- Machine Learning in Materials Science
- Graphite, nuclear technology, radiation studies
- Survey Sampling and Estimation Techniques
- Vacuum and Plasma Arcs
- Metallurgy and Material Science
- Statistical Methods and Bayesian Inference
- Statistical Distribution Estimation and Applications
- Ga2O3 and related materials
- Particle physics theoretical and experimental studies
- Gas Sensing Nanomaterials and Sensors
- Solid-state spectroscopy and crystallography
- ZnO doping and properties
Universität Hamburg
2023-2024
Lala Lajpat Rai University of Veterinary and Animal Sciences
2021
Panjab University
2002-2016
Indian Institute of Technology Kharagpur
2001-2014
University of Delhi
2012-2014
University of the Punjab
2012
Atomic effective pseudopotentials enable atomistic calculations at the level of accuracy density functional theory for semiconductor nanostructures with up to fifty thousand atoms. Since they are directly derived from ab-initio performed in local approximation (LDA), inherit typical underestimated band gaps and masses. We propose an empirical correction based on modification non-local part pseudopotential demonstrate good performance bulk binary materials (InP, ZnS, HgTe, GaAs) quantum dots...
The key to control the fabrication process of transition metal sulfide nanocrystals is understand reaction mechanism, especially coordination ligands and solvents during their synthesis. We utilize in situ High-Energy Resolution Fluorescence Detected X-ray Absorption Spectroscopy (HERFD-XAS) as well valence-to-core Emission (vtc-XES) combined with Density Functional Theory (DFT) calculations identify formation an octahedral [Zn(OA)6]2+ complex, ligand exchange a tetrahedral [Zn(SOA)4]2+...
High-spin states in ${}^{122}$I have been investigated using the ${}^{116}$Cd(${}^{11}$B,5n)${}^{122}$I reaction at a beam energy of 65 MeV and $\ensuremath{\gamma}$-ray coincidence events were recorded with INGA spectrometer. The level scheme has extended up to spin $I=30$. Experimental features, such as band-crossing frequencies, aligned angular momenta, signature splitting, $B(M1)/B(E2)$ ratios used for configuration assignments low-energy band structures. Maximally involving all eight...
The frozen-phonon method, used to calculate electron-phonon coupling effects, requires calculations of the investigated structure using atomic coordinates displaced according certain phonon eigenmodes. process ``freezing in'' specific can bring electronic eigenstates that are energetically close in energy into an anticrossing. This anticrossing effect is, however, unrelated and needs be removed if eigenvalues obtain coupling. We present a procedure for how deal with these problematic...
The bright photoluminescence (PL) of colloidal CdSe quantum dots (QDs) makes them interesting for optical applications. For most them, well-defined PL properties, dominated by a single excitonic state, are required. However, in many experiments with QD ensembles, multiexponential decay was observed. On the basis spin–orbit density functional theory and screened configuration interaction calculations, we show that highly symmetric defect-free QDs diameters 1.7 2.0 nm possess low-temperature...
Excited states in the $^{99}\mathrm{Pd}$ nucleus populated $^{75}\mathrm{As}$($^{28}\mathrm{Si}$, p3n) fusion-evaporation reaction at ${E}_{\mathrm{lab}}$$=$120 MeV have been investigated through in-beam $\ensuremath{\gamma}$-ray spectroscopic techniques using an array of Compton-suppressed clover detectors. The level scheme is established up to excitation energy $~$$11.5$ and spin $~$$25\ensuremath{\hbar}$ with addition about 60 new transitions. structures observed interpreted framework a...
Excited states in the 99Rh nucleus were populated using fusion-evaporation reaction 75As(28Si,2p2n) at and de-excitations investigated through in-beam γ-ray spectroscopic techniques INGA spectrometer consisting of 18 clover detectors. The observed band structures are discussed framework tilted axis cranking shell-model calculations. Level low energies identified as resulting from rotational bands based on configurations. = 1 coupled higher excitation have been interpreted , Calculations...
The bright photoluminescence (PL) of colloidal CdSe quantum dots (QDs) makes them interesting for optical applications. For most well-defined PL properties, dominated by a single excitonic state, are required. However, in many experiments on QD ensembles multiexponential decay was observed. Based spin-orbit density functional theory and screened configuration interaction calculations, we show that highly symmetric defect-free QDs with diameters 1.7 nm 2.0 possess at the single-dot level....
Excited states in the transitional doubly odd $^{102}\mathrm{Ag}$ nucleus were populated $^{75}\mathrm{As}(^{31}\mathrm{P},p3n)$ fusion-evaporation reaction using 125 MeV incident $^{31}\mathrm{P}$ beam. The subsequent deexcitations investigated through in-beam $\ensuremath{\gamma}$-ray spectroscopic techniques Indian National Gamma Array spectrometer equipped with 21 clover Ge detectors. level scheme has been established up to excitation energy $\ensuremath{\sim}6.5$ and angular momentum...
Atomic effective pseudopotentials enable atomistic calculations at the level of accuracy density functional theory for semiconductor nanostructures with up to fifty thousand atoms. Since they are directly derived from ab-initio performed in local approximation (LDA), inherit typical underestimated band gaps and masses. We propose an empirical correction based on modification non-local part pseudopotential demonstrate good performance bulk binary materials (InP, ZnS, HgTe, GaAs) quantum dots...
The origin of the high-frequency shoulder (HFS) observed above longitudinal optical (LO) peak around 230 1/cm in Raman spectra CdSe quantum dots (QDs) has been a subject intense debate. We use state-of-the-art ab initio density functional theory applied to small QDs with various realistic surface passivations and find an signal 1/cm, which corresponds stretching vibration defective twofold coordinated Se atom. interpret this as being HFS. Since disappears fully passivated defect-free (magic...
The key to controlling the fabrication process of transition metal sulfide nanocrystals is understand reaction mechanism, especially coordination ligands and solvents during their synthesis. We utilize
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The origin of the high-frequency shoulder (HFS) observed above longitudinal optical (LO) peak around 230 1/cm in Raman spectra CdSe quantum dots (QDs) has been a subject intense debate. We use state-of-the-art ab initio density functional theory applied to small QDs with various realistic surface passivations and find an signal 1/cm, which corresponds stretching vibration defective twofold coordinated Se atom. interpret this as being HFS. Since disappears fully passivated defect-free (magic...
The origin of the high-frequency shoulder (HFS) observed above longitudinal optical (LO) peak around 230 cm–1 in Raman spectra CdSe quantum dots (QDs) has been subject intense debate. We use state-of-the-art ab initio density functional theory applied to small QDs with various realistic surface passivations and find an signal cm–1, which corresponds a stretching vibration defective 2-fold coordinated Se atom. interpret this as being HFS. Since disappears fully passivated defect-free (magic...
Hot and rotating exotic 124Ce nucleus near proton drip line has been populated through fusion evaporation reaction of 32S 92Mo. This was de-excited by evaporating p, n, α and/or light nuclei etc several have populated. The experimentally obtained relative population those compared with the statistical model calculation. Agreement between experimental calculation observed for most channels. Huge enhancement in comparison to fora few channels related multiple which could not be explained using...
High-spin states of the 112In nucleus have been populated via 100Mo(16O, p3n) reaction at 80 MeV beam energy. Lifetimes excited dipole bands measured using Doppler-shift attenuation method. The B(M1) transition rates deduced from lifetimes show a rapid decrease with increasing angular momentum. in values are well accounted by prediction tilted axis cranking calculations. These measurements confirm presence shears mechanism this nuclei.
Abstract Studies in the past have demonstrated that complete fusion and incomplete (ICF) dynamics are both significant just above Coulomb barrier, yet of ICF elusive since they so complex below 10 MeV/nucleon. In order to investigate low-energy dynamics, we measured forward recoil range distribution (FRRD) evaporation residues (ERs) populated system 14 N + 169 Tm at energy ≈5.9 A stack target-catcher activation technique followed by offline- γ -spectroscopy was used estimate FRRD ERs. a new...
The 2019 Mazurian Lakes Conference on Physics was held in Piaski, a vacation resort located at the lake of Bełdany heart Great District, from 1 st to 7 th September 2019.It 36 meeting series initiated over 50 years ago, 1968, by Professor Zdzisław Wilhelmi and his students collaborators.Throughout these years, conferences have gained world-wide reputation for their high scientific merit unique atmosphere.
The study was carried out to develop low salt buffalo calf meat rolls partially substituting sodium chloride with potassium (maintaining equivalent ionic strength) at the levels of 10% 50%.Substitution up 30% level did not result in any significant variations sensory attributes but further increase caused decline flavor, tenderness, juiciness, texture and overall acceptability.The replacement cause difference proximate composition, water holding capacity, emulsion stability developed...
High spin states of 135La have been investigated using the reaction 128Te(11B,4n)135La at a beam energy 50.5 MeV. Two negative parity dipole bands (ΔI = 1) established. Crossover E2 transitions observed for first time in one bands. For Tilted Axis Cranking (TAC) calculations, three-quasiparticle (3qp) configuration π(h11/2)1⊗ν(h11/2)−2 and five-quasiparticle (5qp) π(h11/2)1(g7/2/d5/2)2⊗ν(h11/2)−2 taken two The comparison experimental observables with TAC calculations supports assignments both