Fig 4 - uploaded by Bichitra Ganguly
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Decay scheme of 111m Cd 48 , IT, T 1/2 = 48.54 m, isomeric level with 5/2 + spin where EFG tensor interacts with nuclear quadrupole moment Q, an illustration of the typical PAC measurement.
Source publication
Nano-crystalline ZnO has been studied with perturbed angular correlation using 111mCd, implanted at ISOLDE/CERN and X-ray diffraction using Rietveld analysis. The data show a gradual increase in the crystal size and stress for a sample annealed at 600 °C, and reaching nearly properties of standard ZnO with tempering at 1000 °C. The perturbed angula...
Contexts in source publication
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... PAC machine consists of a setup of usually four or six detectors which measure the time difference between the c 1 and c 2 -ray as shown in Fig. 4, from which the radioactive decay curve of the inter- mediate level of 111m Cd with a life time of %84.5 ns has been obtained. Due to the anisotropy of the emitted radiation, ripples on the decay curve become visible when electric quadrupole or/and magnetic dipole interaction, e.g. electric field gradient (EFG) or local magnetic fields in magnetic materials, are non-zero as shown in Fig. 4 (see in the middle). The counting rate ratio, R(t), is obtained from the coincidence data ...
Context 2
... PAC machine consists of a setup of usually four or six detectors which measure the time difference between the c 1 and c 2 -ray as shown in Fig. 4, from which the radioactive decay curve of the inter- mediate level of 111m Cd with a life time of %84.5 ns has been obtained. Due to the anisotropy of the emitted radiation, ripples on the decay curve become visible when electric quadrupole or/and magnetic dipole interaction, e.g. electric field gradient (EFG) or local magnetic fields in magnetic materials, are non-zero as shown in Fig. 4 (see in the middle). The counting rate ratio, R(t), is obtained from the coincidence data ...
Context 3
... time differential perturbed angular correlation technique is based on the modulation of angular correlation of the successive radiations emitted during a nuclear decay cascade due to hyperfine interactions between the electromagnetic moments of the intermediate nuclear level with its immediate neighboring elec- tronic environment. Suitable isotopes for standard PAC have an intermediate level (sensitive level) which has a half-life between 10 and 1000 ns (see Fig. 4), while the half-life of the parent isotope is sufficiently long lived to provide a measurement. 111 In with a 2.8 days half-life and simple cascade is one of the most and widely-used PAC probes. However, the so-called after effects, resulting from the change of electronic charge state from 111 In 3+ to 111 Cd 2+ , can be problematic especially in semiconductors [30]. In order to minimize these effects, the 111m Cd 2+ radioactive ion is more suitable as it does not undergo any such transmutation. However, its short half life of 48 min restricts its availability to on-site measurements at a facility such as ISOLDE at ...
Citations
An organic-inorganic nanohybrid system (AMC-CdS QD) comprised of a fluorescent carbazole analog, AMC (3-amino-N-methyl carbazole), and CdS QDs has been synthesized, which shows promise as a sustainable energy harvesting material. FT-IR and ¹H NMR spectroscopy have ascertained the covalent grafting of the carbazole moieties onto the mercaptopropionic acid (MPA)-capped surface of the CdS QDs. Detailed photophysical characterization of this nanohybrid system have confirmed the efficient Fӧrster resonance energy transfer (FRET) observed from its organic to inorganic counterpart. This phenomenon was also demondtrated using SCC-DFTB-based quantum chemical calculations. As explored in the present work, the photoelectron transfer efficiency of AMC-CdS QDs signifies their plausible future applications as light-harvesting materials.
