A5076495165- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Glass properties and applications
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Crystallography and molecular interactions
- Energetic Materials and Combustion
- Spectroscopy and Quantum Chemical Studies
- Organic and Molecular Conductors Research
- Semiconductor materials and devices
- Inorganic Fluorides and Related Compounds
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Photochemistry and Electron Transfer Studies
- Diamond and Carbon-based Materials Research
- Nonlinear Optical Materials Research
- Bone Tissue Engineering Materials
- Nuclear Physics and Applications
- Analytical Chemistry and Sensors
- Magnetism in coordination complexes
- Molecular spectroscopy and chirality
- Particle accelerators and beam dynamics
Bhabha Atomic Research Centre
2012-2024
Vinoba Bhave University
2021-2023
Homi Bhabha National Institute
2017-2020
Bhabha Atomic Research Center Hospital
2012-2017
Department of Atomic Energy
2017
Misato Observatory
1999-2004
We report here the evidences of hydrogen bond symmetrization in simplest amino acid- carboxylic acid complex, glycinium oxalate, at moderate pressures 8 GPa using in-situ infrared and Raman spectroscopic investigations combined with first-principles simulations. The protonation semioxalate units through dynamic proton movement results infinite oxalate chains. At above 12 GPa, glycine systematically reorient pressure to form bonded supramolecular assemblies held together by these
The strengthening of hydrogen bonds is favored by the cooperative effect in oxalic acid dihydrate. Pressure induced proton transfer restricts water oxygen to be an acceptor and ionizes local structural moieties.
We present investigations of the presence oxides, hydrides, and hydrocarbons in high-purity (residual resistivity ratio, ∼300) niobium (Nb) materials used fabrication superconducting radio frequency (SRF) cavities for particle accelerators. Raman spectroscopy Nb (as-received from vendor as well after surface chemical- thermal processing) revealed numerous peaks, which evidently show oxides (550 cm−1), hydrides (1277 1385 cm−1: ∼80 K temperature), groups (1096, 2330, 2710, 2830, 2868, 3080...
Dimethyl ammonium (DMA) metal formate, an important member of the dense organic framework (MOF) family, is known to exhibit a low temperature ferroelectric transition, caused by ordering hydrogen bonds. In this study, we probed effect pressure on disordered bond and HCOO- linkers DMA manganese with help XRD, IR Raman spectroscopic studies up ∼20 GPa. We observed that though phase transition was initiated at ∼3.4 GPa, it complete only 6 indicating its first order nature. Beyond 7 compound...
We have carried out Raman spectroscopic measurements on atactic polystyrene (aPS) under shock compression up to 2 GPa. Observed wavenumber shifts of active modes been used determine their Grüneisen parameters and bond anharmonicities. mode at 798 cm −1 displays maximum blue shift 4.95 /GPa. Our observed are found be consistent with the earlier results obtained hydrostatic pressure. also evaluated pressure through 1D radiation hydrodynamic simulations, in good agreement experimental values....
An<italic>in situ</italic>high pressure-FTIR study on a 2,3-dichlorobenzylidine-4-bromoaniline elastic crystal shows significant structural changes at high pressure which revert back to the ambient structure decompression.
Abstract Yttrium oxide (Y 2 O 3 ) thin films were deposited by microwave electron cyclotron resonance (ECR) plasma assisted metal organic chemical vapour deposition (MOCVD) process using indigenously developed precursors 2,7,7‐trimethyl‐3,5‐octanedionates, commonly known as Y(tod) which synthesized an ultrasound method. A series of varying the oxygen flow rate from 1–9 sccm, keeping all other parameters constant. The coatings characterized X‐ray photoelectron spectroscopy, glancing angle...