35 Result(s)

Article

Thermally stimulated luminescence and electron paramagnetic resonance studies on uranium doped calcium phosphate

Thermally stimulated luminescence (TSL) and electron paramagnetic resonance (EPR) studies on uranium doped calcium phosphate yielded mechanistic information on the observed glow peaks at 365, 410 and 450 K. TS...

V. Natarajan, T. K. Seshagiri… in Journal of Radioanalytical and Nuclear Che… (2003)

Article

Spin-trap** studies on the reaction of NO₂ with β-carotene

Absorption spectrophotometric studies indicated that in chloroform β-carotene reacted with NO2 with a stoichiometry of 1:2. To understand the reaction mechanism, free radical intermediates produced during their r...

S. M. Khopde, K. I. Priyadarsini, M. K. Bhide… in Research on Chemical Intermediates (2003)

Article

Radiation effects in plutonium and carbonate co-doped calcium hydroxy apatite: An EPR study

Electron paramagnetic resonance studies were conducted on synthetic calcium hydroxy apatite samples co-doped with ²³⁹Pu and carbonate ion. These investigations were carried out to assess the self-irradiation effe...

V. Natarajan, T. K. Seshagiri… in Journal of Radioanalytical and Nuclear Che… (2003)

Article

Non-equilibrium effects in copper vapor laser pumped Nd³⁺ doped PVA film: Photo-electon paramagnetic resonance and photoacoustic spectral investigations

Photo-EPR measurements carried out on Nd³⁺ -doped polyvinyl alcohol (PVA) films have shown that nearly 100% reduction occurs in the intensity of EPR of Nd³⁺ under in situ copper vapor laser (CVL) illumination (51...

Mithlesh Kumar, Y Babu, A R Dhobale, R M Kadam, M D Sastry in Pramana (2002)

Article

Experimental evidence of photoinduced valence change of Fe³⁺ in BaTiO₃ and mechanism for growth of new grating in depleted pump condition: An EPR investigation

With a view to understanding the role of photo-induced valence changes of impurities in BaTiO₃ in the phenomena of photorefraction, EPR experiments were conducted under in situ He-Ne laser illumination. These exp...

M D Sastry, M Moghbel, Putcha Venkateswarlu, A Darwish in Pramana (2001)

Article

Detergent Powder: Investigation for Feasible Retrospective Dosimetry Using ESR Technique

An Electron Spin Resonance (ESR) study of radiation induced free radicals in the commonly used detergent powder (Surf), was conducted to examine its potential application for retrospective/high level dosimetry...

S. Murali, V. Natarajan, R. Venkataramani… in Journal of Radioanalytical and Nuclear Che… (2000)

Article

Photoinduced changes in photorefractive PVA films doped with Cr³⁺ and VO²⁺: EPR and PAS investigations

In order to understand the mechanism of optical image storage in photorefractive polyvinyl alcohol (PVA) films, photo-EPR and photoacoustic spectral investigations were carried out on PVA films doped with Cr³⁺ an...

Mithlesh Kumar, A. R. Dhobale, R. M. Kadam, M. D. Sastry in Pramana (1999)

Article

Photoacoustic cell with black absorber as a detector for spectrophotometric studies

The PAS cell with carbon black absorber is used as a detector for spectrophotometry in an open room. This has immense potential of obtaining absorption speciation information from remote samples.

A. R. Dhobale, M. D. Sastry in Pramana (1999)

Article

Contributory presentations/posters

N. Manoj, V. R. Srinivas, A. Surolia, M. Vijayan, K. Suguna… in Journal of Biosciences (1999)

Article

Electron paramagnetic resonance studies of photorefractive crystals II: Fe³⁺ doped Bi₁₂SiO₂₀ with copper vapour laser illumination in 10–100 K range

Photo-induced charge transfer and its kinetics were investigated in Bi₁₂SiO₂₀ in 10–300 K temperature range, using EPR of Fe³⁺ centre, underin situ illumination with copper vapour laser (CVL). The decay kinetics ...

N K Porwal, R M Kadam, Y Babu, M D Sastry, M D Aggarwal, Putcha Venkateswarlu in Pramana (1997)

Article

Electron paramagnetic resonance studies in photorefractive crystals I: Hyperfine interaction and photoinduced charge transfer in²³³U⁵⁺ and²³⁸U⁵⁺ doped LiNbO₃

Electron paramagnetic resonance studies were conducted on the photoinduced charge transfer and also hyperfine interaction of U⁵⁺ stabilized in photorefractive matrix LiNbO₃. This work deals with: (i) first observ...

N K Porwal, Mithlesh Kumar, M D Sastry in Pramana (1996)

Article

Radiation stabilization of U⁵⁺ in CaO matrix and its thermal stability: Electron paramagnetic resonance and thermally stimulated luminescence studies

Electron paramagnetic resonance (EPR) evidence is presented for the radiation stabilization of pentavalent uranium in CaO matrix. From the theoretical predictions ofg value for U⁵⁺ in axial symmetries, it was con...

V Natarajan, T K Seshagiri, M D Sastry in Pramana (1996)

Article

Impurity mediated mechanism of photorefractive effect in BaTiO₃: A combination of sangster and piezoelectric effects

An impurity mediated mechanism of photorefractive effect in BaTiO₃ is proposed. The photoinduced changes in the relative concentration of Fe³⁺ in BaTiO₃ results in an electro-optic coupling through a combination ...

M D Sastry, M Moghbel, Putcha Venkateswarlu in Pramana (1996)

Article

Radiation induced stabilization of unusual oxidation states in Tl (I) Ln (III) (SO₄)₂.4H₂O (Ln=Sm, Eu and Nd): EPR investigations

Double sulfates of thallium and lanthanides form an interesting series of compounds with first fractional crystallization leading to the formation of tetrahydrated double sulfates. The radiation induced defect...

S. V. Godbole, P. N. Iyer… in Journal of Radioanalytical and Nuclear Che… (1996)

Article

Internal irradiation effects in²³⁹Pu doped K₂Ca₂(SO₄)₃): EPR, TSL and PAS investigations

The electron/hole trapped centres created during internal irradiation in²³⁹Pu doped K₂Ca₂(SO₄)₃ were investigated using electron paramagnetic resonance (EPR), thermally stimulated luminescence (TSL) and photoacou...

T K Seshagiri, V Natarajan, A R Dhobale, M D Sastry in Pramana (1996)

Article

Evidence for superconductivity in fluorinated La₂CuO₄ at 35 K: Microwave investigations

In the fluorinated La₂CuO_4−x prepared using a solid state reaction with NH₄HF₂ as a fluorinating agent at 550 K at ambient pressure, superconductivity was detected by microwave and EPR te...

G M Phatak, K Gangadharan, R M Kadam, M D Sastry, U R K Rao in Pramana (1996)

Article

Atomization mechanism and determination of Ag, Be, Cd, Li, Na, Sn and Zn in uranium-plutonium matrices by ETA-AAS

The atomization processes involved in the Electrothermal Atomization-Atomic Absorption Spectrometric (ETA-AAS) determination of Ag, Be, Cd, Li, Na, Sn and Zn in the presence of an uranium-plutonium matrix cont...

Neelam Goyal, Paru J. Purohit, A. G. Page… in Fresenius' Journal of Analytical Chemistry (1996)

Article

Thermally stimulated luminescence and electron paramagnetic resonance studies on uranium doped K₂Ca₂(SO₄)₃

Thermally stimulated luminescence (TSL) studies of gamma-irradiated uraniumdoped K₂Ca₂(SO₄)₃ revealed two glow peaks around 400 K and 435 K. Electron paramagnetic resonance (EPR) studies carried out on these samp...

T K Seshagiri, V Natarajan, M D Sastry in Pramana (1995)

Article

Dose determination by ESR in an accident, using cotton fabric

Accidental exposure dose assessment by electron spin resonance (ESR) technique from the free radicals generated in a cotton handkerchief has been attempted in this investigation. The cotton handkerchief, a com...

R. Venkataramani, S. K. Mehta, M. R. Iyer… in Journal of Radioanalytical and Nuclear Che… (1993)

Article

Thermally stimulated luminescence and electron paramagnetic resonance studies of actinide doped calcium chloro phosphate

Electron paramagnetic resonance [EPR] and thermally stimulated luminescence [TSL] studies were conducted on self [α]-irradiated²³⁹Pu doped calcium chloro phosphate andγ-irradiated²³⁹Pu/²³⁸UO ₂ ...

T K Seshagiri, V Natarajan, M D Sastry in Pramana (1992)