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13 Result(s)

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  1. No Access

    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)

  2. No Access

    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)

  3. No Access

    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)

  4. No Access

    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)

  5. No Access

    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)

  6. No Access

    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)

  7. No Access

    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)

  8. No Access

    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)

  9. No Access

    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)

  10. No Access

    Article

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

    In the fluorinated La2CuO4−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)

  11. No Access

    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)

  12. No Access

    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)

  13. No Access

    Article

    Electron paramagnetic resonance and thermally stimulated luminescence studies of uranyl doped calcium sulphate

    Electron paramagnetic resonance (EPR) and thermally stimulated luminescence (TSL) studies were conducted onγ-irradiated CaSO4:UO 2 2+ to elucidate the role of ...

    T K Seshagiri, V Natarajan, A G I Dalvi, M D Sastry in Pramana (1989)