Effect of the Diffraction of Annihilation γ-Rays on Their Angular Correlation in a Single Crystal Specimen

1971 ◽  
Vol 31 (2) ◽  
pp. 563-573 ◽  
Author(s):  
Toshio Hyodo ◽  
Osamu Sueoka ◽  
Kunio Fujiwara
Keyword(s):  
Single Crystal ◽  
Angular Correlation ◽  
Single Crystal Specimen ◽  
Γ Rays

Application of204mPb Perturbed Angular Correlation of γ-rays Spectroscopy in Coordination Chemistry

2012 ◽  
Vol 51 (4) ◽  
pp. 1992-1994 ◽  
Author(s):  
Johan Vibenholt ◽  
Magnus Schau-Magnussen ◽  
Monika Stachura ◽  
Morten J. Bjerrum ◽  
Peter W. Thulstrup ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Γ Rays

Reexamination of the crystal structure of semseyite, Pb9Sb8S21

2018 ◽  
Vol 233 (3-4) ◽  
pp. 279-284 ◽  
Author(s):  
Yoshitaka Matsushita
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Single Crystal ◽  
Structure Refinement ◽  
Unit Cell ◽  
Crystal Structure Refinement ◽  
Cell Level ◽  
Single Crystal Specimen ◽  
Cation Sites ◽  
Occupancy Behavior

AbstractThe crystal structure of semseyite, Pb9Sb8S21was successfully refined using a single-crystal specimen from Wolfsberg, Harz, Germany, having chemical composition (EPMA) Pb9.01(1)Sb8.00(3)S21.05(5). The structure belongs to the monoclinicC2/cspace group (a=13.6267(10) Å,b=11.9742(9) Å,c=24.5891(18) Å,β=105.997(3)°,V=3856.8(5) Å3,Z=4,Dc=6.048 g/cm3). Crystal structure refinement with all atoms refined anisotropically converged toR1=4.64% (I>2σ(I)). The crystal structure is built of two subunits (A and B) showing TlSbS2-like topology. Each of them stacks parallel to (001), andc/2 in thickness. Two cation sites (Pb1 and Sb5) located at central part of the subunit, show mixed occupancy behavior as 95% Pb and 5% Sb at the Pb5 site, and 95% Sb and 5% Pb at the Sb1 site, respectively. Each of subunits are related by unit cell-level twinning mechanism “tropochemical cell twinning” with the TlSbS2-like subunits alternatively parallel to (1 1 −4) and (−1 1 4) planes.

Nuclear alinement of manganese-56

1959 ◽  
Vol 250 (1263) ◽  
pp. 550-561 ◽  
Keyword(s):  
Angular Distribution ◽  
Excited State ◽  
Angular Correlation ◽  
Excited States ◽  
Daughter Nucleus ◽  
Γ Radiation ◽  
Mixing Ratios ◽  
First Excited State ◽  
Γ Rays ◽  
Coincidence Measurements

The present work demonstrates the feasibility of alining manganese-56 produced by neutron irradiation of a nickel fluosilicate crystal containing stable 55 Mn. Measurements were made of the angular distribution of the γ-radiation from the alined 56 Mn and also of the angular correlation of the γ-rays from this isotope. By combining the results it is possible to establish uniquely as 2 the spins of the states of the daughter nucleus of 56 Fe at 2.66 and 2.98 MeV. The mixing ratios δ ( E 2/ M 1) for the 1.81 and 2.13 MeV γ-rays to the first excited state are shown to be 0.19 ± 0.02 and — 0.28 ± 0.02. The spectrum of the γ-radiation was studied with a scintillation spectrometer and this leads to the following relative intensities; 0.845 MeV (100%), 1.81 MeV (27 ± 3%), 2.13 MeV (15 ± 3%), 2.55 MeV (1.2 ± 0.2%), 2.66 MeV (0.65 ± 0.1%), 2.98 MeV (0.35 ± 0.1%) and 3.4 MeV (0.22 ± 0.05%). Coincidence measurements suggest that the 2.55 and 3.4 MeV γ-rays are due to de-excitation of a level at about 3.4 MeV which decays both to the ground and first excited states. A spin of 2 for this state is proposed.

scholarly journals Nanosecond Dynamics at Protein Metal Sites: An Application of Perturbed Angular Correlation (PAC) of γ-Rays Spectroscopy

2017 ◽  
Vol 50 (9) ◽  
pp. 2225-2232 ◽  
Author(s):  
Saumen Chakraborty ◽  
Stavroula Pallada ◽  
Jeppe T. Pedersen ◽  
Attila Jancso ◽  
Joao G. Correia ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Γ Rays ◽  
Nanosecond Dynamics

Design and calibration of a source and a polarimeter for polarized 14.4 keV Mössbauer gamma rays

1980 ◽  
Vol 58 (7) ◽  
pp. 1010-1018 ◽  
Author(s):  
J. M. Daniels ◽  
H. Y. Lam ◽  
P. L. Li
Keyword(s):  
Single Crystal ◽  
Gamma Rays ◽  
Γ Rays

A source of polarized 14.4 keV Mössbauer γ rays, using a magnetized foil, and a polarizer using a single crystal of siderite, are described. The procedures for determining the polarization of the γ rays, and for calibrating and using the polarimeter, are described in detail.

Fast cadmium inhibition of photosynthesis in cyanobacteria in vivo and in vitro studies using perturbed angular correlation of γ-rays

2006 ◽  
Vol 11 (6) ◽  
pp. 725-734 ◽  
Author(s):  
Klára Nárcisz Sas ◽  
László Kovács ◽  
Ottó Zsίros ◽  
Zoltán Gombos ◽  
Győző Garab ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
In Vitro Studies ◽  
Γ Rays
Sign in / Sign up

Export Citation Format

Share Document